{
  "response": {
    "Key": "IAH-HKG",
    "orig": {
      "code": "IAH",
      "type": "airport",
      "city": "Houston",
      "fullCity": "Houston, Texas",
      "airport": "George Bush Intercontinental Airport"
    },
    "dest": {
      "code": "HKG",
      "type": "airport",
      "city": "Hong Kong",
      "fullCity": "Hong Kong, Hong Kong",
      "airport": "Hong Kong Intl Airport"
    },
    "faq": {
      "q0": {
        "question": "What is the typical flight duration from Houston to Hong Kong?",
        "answer": "There is no nonstop service from Houston to Hong Kong, so the journey requires at least one connection and typically takes around 20 to 22 hours total. The direct distance between the airports is about 8,340 miles.",
        "methodology": "Flight times and distances come from our flight-schedule database, which combines published airline timetables, U.S. government schedule data from the Bureau of Transportation Statistics (BTS), and observed flight operations from the EUROCONTROL/OpenSky Open Performance Data Initiative (OPDI). The typical flight time is the median scheduled block time across all carriers on the route, computed the same way in both directions so the difference reflects prevailing winds rather than any change in method. Distance is the great-circle distance between the two airports, so the actual flown track is typically 2-5% longer.",
        "toolsUsed": [
          "flight_schedule"
        ]
      },
      "q1": {
        "question": "Are there any direct flights from Houston to Hong Kong?",
        "answer": "There are no nonstop flights from Houston (IAH) to Hong Kong (HKG). The quickest one-stop options connect via the US West Coast — United through San Francisco or Los Angeles — with a total travel time around 17 to 18 hours. Other common routings involve a single connection in Taipei (EVA Air), Vancouver (Air Canada / United), or Tokyo (ANA / United), typically taking 18 to 22 hours depending on the layover.",
        "methodology": "Airlines and weekly frequencies are compiled from our flight-schedule database, which combines published airline timetables, U.S. government schedule data from the Bureau of Transportation Statistics (BTS), and observed flight operations from the EUROCONTROL/OpenSky Open Performance Data Initiative (OPDI). We count each operating carrier's scheduled weekly departures and the days it flies; where there is no nonstop service, connecting carriers are identified by linking scheduled nonstop segments through common hub airports. Where a median fare is shown for a carrier, it reflects the real fares Priceline users found on this route in the last 72 hours. Carrier service, flight times and distances for this route come from our flight-schedule database, which draws on published airline timetables, U.S. government schedule data, and observed operations from the EUROCONTROL/OpenSky Open Performance Data Initiative (OPDI). We report the days of the week and the departure times each carrier operates. The typical flight time is the median scheduled block time, given both per carrier and across all carriers on the route; where a schedule does not publish an elapsed time, it is derived from the scheduled departure and arrival times converted to UTC. Outbound and return times are computed by the same method, so the difference between them is directly comparable and reflects prevailing winds rather than any change in derivation. Distance is the great-circle distance between the two specific airports named, so an actual flown track is typically 2-5% longer. Where shown, on-time departure and arrival rates and cancellation rates come from the U.S. Bureau of Transportation Statistics (BTS) Airline On-Time Performance dataset, which covers U.S. domestic routes only; where a typical fare is shown, it comes from the U.S. DOT Airline Origin and Destination Survey (DB1B), a quarterly 10% sample of tickets sold. Aircraft types are taken from the equipment each operating carrier schedules on this route, drawn from published airline timetables and airline equipment schedules in our flight-schedule database. They describe typical scheduled aircraft and can vary with seasonal or day-of-week assignments and last-minute equipment swaps.",
        "toolsUsed": [
          "route_airlines",
          "flight_schedule",
          "route_aircraft"
        ]
      },
      "q2": {
        "question": "Are there visa requirements to travel from Houston to Hong Kong?",
        "answer": "For United States citizens, no visa is required for a short tourist visit to Hong Kong; entry is visa-free for stays of up to 90 days. Simply present a valid U.S. passport on arrival.\n\nThis is general guidance to help you plan, not official immigration advice — entry rules can change and can depend on your nationality and circumstances, so please confirm the current requirements with the relevant embassy or official government source before you travel.",
        "toolsUsed": [
          "article_lookup"
        ],
        "references": [
          {
            "url": "https://en.wikipedia.org/wiki/Visa_policy_of_Hong_Kong",
            "title": "Visa policy of Hong Kong",
            "favicon": "https://en.wikipedia.org/static/favicon/wikipedia.ico"
          },
          {
            "url": "https://www.gov.uk/foreign-travel-advice/hong-kong/entry-requirements",
            "title": "Hong Kong entry requirements — GOV.UK",
            "favicon": "https://www.gov.uk/favicon.ico"
          }
        ],
        "preopenedReferences": true,
        "stageOnly": true
      },
      "q3": {
        "question": "What are the ground transportation options in Hong Kong?",
        "answer": "From Hong Kong International Airport, the Airport Express rail line is the fastest way to reach the city center, while public buses offer extensive coverage across Hong Kong. Taxis provide flexible door-to-door service, and special transport options include residents' coaches and services for travelers with special needs. The Airport Express is the most-used and quickest option for most travelers heading downtown.",
        "toolsUsed": [
          "article_lookup"
        ],
        "references": [
          {
            "url": "https://hongkongairport.com/en/transport/to-from-airport",
            "title": "Overview, To and From Airport - Hong Kong International Airport",
            "favicon": "https://hongkongairport.com/iwov-resources/image/common/icon/favicon.ico"
          },
          {
            "url": "https://hongkongairport.com/tc/transport",
            "title": "æ¦ è¦½½½, ä¾¾¾ å¾¾¾ æ© å ´ç  äº¤é  è¨­æ ½½½ - é¦ æ¸¯å  é  æ© å",
            "time_published": "2026-03-30T00:00:00Z"
          },
          {
            "url": "https://hongkongairport.com/en/transport/to-from-airport/taxis.page",
            "title": "Taxis, To and From Airport - Hong Kong International Airport",
            "favicon": "https://hongkongairport.com/iwov-resources/image/common/icon/favicon.ico"
          },
          {
            "url": "https://www.hongkongairport.com/en/transport/mainland-connection/mainland-coaches/",
            "title": "Chinese Mainland Coaches, Chinese Mainland Connection - Hong Kong International Airport",
            "favicon": "https://www.hongkongairport.com/iwov-resources/image/common/icon/favicon.ico"
          }
        ]
      },
      "q4": {
        "question": "When is the cheapest time to fly from Houston to Hong Kong?",
        "answer": "Average fares from Houston to Hong Kong bottom out around $411 in late January, with the cheapest months overall being October ($428), February ($431), and September ($434). The most expensive stretch is late December, when average fares climb to about $524, and the priciest months are July ($514), June ($506), and December ($501).",
        "methodology": "Seasonal fares come from Priceline's own air booking-summary archive, analysed in-house and refreshed monthly. For each day of the year we take a representative round-trip fare, a blend of the 25th-percentile and average ticket price over the route's bookings, and smooth the series into a seasonal curve; the half-month low and high and the monthly figures quoted here are averages of that curve. Thin and international routes borrow their seasonal shape from the nearest busy routes, with the price level anchored to the route's own bookings.",
        "toolsUsed": [
          "seasonal_prices"
        ]
      },
      "q5": {
        "question": "How far in advance should I book tickets from Houston to Hong Kong?",
        "answer": "For flights from Houston to Hong Kong, the best time to book is roughly 3 to 6 weeks before departure, when average fares sit around $364. The absolute cheapest window is about 30 days out, at roughly $360, while booking six months early typically costs over $575. For summer and major holiday periods, demand pushes prices higher, so you'd want to book on the earlier end of that window or slightly beyond it to lock in a lower fare.",
        "methodology": "Booking-window guidance comes from the same monthly in-house analysis of Priceline's own air booking-summary archive. We aggregate the route's bookings by how many days before departure they were made, from about 180 days out to the day of travel, smooth the curve, and highlight the stretch of lead times with the lowest average fare. Thin and international routes borrow the curve shape from the nearest busy routes, anchored to the route's own price level. It reflects current fares and is refreshed monthly.",
        "toolsUsed": [
          "booking_timing"
        ]
      },
      "q6": {
        "question": "Are overnight (red‑eye) flights available from Houston to Hong Kong?",
        "answer": "There are no nonstop red-eye flights from Houston (IAH) to Hong Kong (HKG), but connecting itineraries whose long leg is an overnight flight are available. For example, United offers a red-eye from San Francisco departing at 11:50 PM and arriving in Hong Kong at 5:00 AM, or from Los Angeles departing at 11:55 PM and arriving at 5:40 AM; Cathay Pacific also operates a red-eye from Dallas/Fort Worth departing at 10:55 PM and arriving at 4:05 AM, each connecting from a short domestic hop from Houston.",
        "methodology": "Red-eye flights are identified from scheduled local departure and arrival times in our flight-schedule database — built from published airline timetables and official schedule data, including U.S. Department of Transportation records for domestic routes — flagging services that depart late at night and arrive the following morning; for connecting itineraries the red-eye is based on the timing of the overnight long-haul leg.",
        "toolsUsed": [
          "redeye_flights"
        ]
      },
      "q7": {
        "question": "Which airlines usually operate this route from Houston to Hong Kong?",
        "answer": "There is no nonstop service between Houston and Hong Kong. United Airlines offers the most frequent one-stop connections, with 16 daily itineraries via San Francisco and 8 via Los Angeles. EVA Air operates 6 daily connections through Taipei, while Cathay Pacific offers 4 daily one-stop options via Chicago and 1 via Dallas. Air Canada provides a small number of connections through Vancouver, with 1 daily itinerary each on its own metal and on United-operated legs.",
        "methodology": "Airlines and weekly frequencies come from our flight-schedule database, which combines published airline timetables, U.S. government schedule data from the Bureau of Transportation Statistics (BTS), and observed flight operations from the EUROCONTROL/OpenSky Open Performance Data Initiative (OPDI). We count each operating carrier's scheduled weekly departures and the days it flies; where there is no nonstop service, connecting carriers are identified by linking scheduled nonstop segments through common hub airports. Where a typical fare is shown for a carrier, it is the median of the real fares Priceline users found on this route in the last 72 hours.",
        "toolsUsed": [
          "route_airlines"
        ]
      },
      "q8": {
        "question": "If I need a connection, what are common layover cities between Houston and Hong Kong?",
        "answer": "Common layover cities include Tokyo (Narita or Haneda), Seoul (Incheon), and Taipei. These hubs offer broad connections and efficient transfers, often with visa‑free transit for eligible passengers, keeping total travel times competitive."
      },
      "q10": {
        "question": "Which months have the best weather for traveling to Hong Kong?",
        "answer": "October to early December offers pleasant temperatures, low humidity, and fewer tourists."
      },
      "q11": {
        "question": "What documents should I bring with me to the airport when flying from Houston to Hong Kong?",
        "answer": "Bring a passport valid for at least six months beyond your stay, any required visa or travel authorization for Hong Kong, proof of onward or return travel, a payment method for baggage, and any required vaccination certificates."
      },
      "q12": {
        "question": "Which airport should I use in Hong Kong?",
        "answer": "Hong Kong International Airport is the sole commercial airport serving Hong Kong. It is located on Chek Lap Kok island, about 34 kilometres west of Central, and handles all international and regional flights with excellent connections to the city via the Airport Express train."
      },
      "q13": {
        "question": "How do I get to George Bush Intercontinental Airport from the city center?",
        "answer": "From downtown Houston, the 500 IAH Downtown Direct is a dedicated METRO bus that runs nonstop between the George R. Brown Convention Center area and IAH Terminal E, taking about 30–45 minutes and costing $4.50 one way, making it the cheapest and most popular option for many travelers. Ride-share services like Uber and Lyft, along with taxis, offer door-to-door convenience from the city center and are generally faster during off-peak hours but cost significantly more. Shuttle buses serve hotels and off-airport parking lots, while driving yourself is possible with on-site or off-site parking, though it adds the cost of parking plus potential traffic delays. The Downtown Direct bus is the most budget-friendly, while ride-share or taxi is usually the fastest and most convenient.",
        "toolsUsed": [
          "article_lookup"
        ],
        "references": [
          {
            "url": "https://fly2houston.com/iah/ground-transportation",
            "title": "Ground Transportation | Airport Taxi, Uber, Lyft, Shuttle & Rent Car Houston"
          },
          {
            "url": "https://fly2houston.com/iah/ground-transportation/shuttles-and-buses",
            "title": "IAH Airport Shuttle & Bus Service | Houston Ground Transportation",
            "time_published": "2026-05-02T07:23:56Z"
          },
          {
            "url": "https://fly2houston.com/iah/ground-transportation/metro-downtown-direct",
            "title": "Downtown Direct"
          },
          {
            "url": "https://www.fly2houston.com/",
            "title": "Houston Airport System",
            "time_published": "2026-04-02T20:31:01Z"
          },
          {
            "url": "https://en.wikipedia.org/wiki/George_Bush_Intercontinental_Airport",
            "title": "George Bush Intercontinental Airport",
            "favicon": "https://en.wikipedia.org/static/apple-touch/wikipedia.png",
            "time_published": "2026-08-28T04:59:46Z"
          }
        ]
      },
      "q14": {
        "question": "Are there hotels or sleeping facilities at Hong Kong airport?",
        "answer": "Hong Kong Airport has the Regal Airport Hotel directly connected to Terminal 1 via an air-conditioned bridge on Level 5, about a two-minute walk from the terminal, with day rooms available from 7:00 AM to 11:00 PM. The airport also offers free Resting Lounges with cushioned recliners airside on the Departures Level near many gates, as well as several pay-per-use lounges with rest zones and showers. For uninterrupted sleep, the Regal Airport Hotel is the on-site option, while several nearby hotels provide shuttle service.",
        "toolsUsed": [
          "article_lookup"
        ],
        "references": [
          {
            "url": "https://hongkongairport.com/en/passenger-guide/airport-facilities-services/resting-lounges",
            "title": "Resting Lounges, Airport Facilities & Services - Hong Kong International Airport",
            "favicon": "https://hongkongairport.com/iwov-resources/image/common/icon/favicon.ico"
          },
          {
            "url": "https://sleepinginairports.net/guides/hong-kong-airport-guide.htm",
            "title": "Hong Kong Airport Guide (HKG) - Sleeping in Airports",
            "favicon": "https://www.sleepinginairports.net/nitropack_static/oBWrHkPujHTPIaVWqdDSDhClXUyrYhhb/assets/images/optimized/rev-b853180/www.sleepinginairports.net/wp-content/uploads/2018/09/cropped-sia-logo-180x180.png",
            "time_published": "2018-08-25T14:38:29Z"
          },
          {
            "url": "https://hongkongairport.com/en/passenger-guide/airport-facilities-services",
            "title": "Airport Facilities and Services, Passenger Guide - Hong Kong International Airport",
            "favicon": "https://hongkongairport.com/iwov-resources/image/common/icon/favicon.ico"
          },
          {
            "url": "https://hongkongairport.com/en/passenger-guide/hotels-business-services/regal-airport-hotel",
            "title": "Hotels & Business Services",
            "favicon": "https://hongkongairport.com/iwov-resources/image/common/icon/favicon.ico"
          }
        ]
      },
      "q15": {
        "question": "Are there currency exchange offices, prayer rooms and Wi‑Fi at Hong Kong Intl Airport?",
        "answer": "Hong Kong International Airport does offer currency exchange and banking services, and it also provides prayer rooms for passengers. Wi-Fi and internet access are available throughout the airport, and complimentary shower facilities are located near Gates 12 and 43 on the Arrivals Level (L5). Currency exchange and banking services are listed among the airport's facilities, and prayer rooms are also available for travelers.",
        "toolsUsed": [
          "article_lookup"
        ],
        "references": [
          {
            "url": "https://hongkongairport.com/en/passenger-guide/airport-facilities-services",
            "title": "Airport Facilities and Services, Passenger Guide - Hong Kong International Airport",
            "favicon": "https://hongkongairport.com/iwov-resources/image/common/icon/favicon.ico"
          },
          {
            "url": "https://www.hongkongairport.com/en/passenger-guide/airport-facilities-services/airline-lounges",
            "title": "Airline Lounges, Airport Facilities & Services - Hong Kong International Airport",
            "favicon": "https://www.hongkongairport.com/iwov-resources/image/common/icon/favicon.ico"
          },
          {
            "url": "https://hongkongairport.com/en/passenger-guide/airport-facilities-services/transfer-desk",
            "title": "Airport Facilities and Services, Passenger Guide - Hong Kong International Airport",
            "favicon": "https://hongkongairport.com/iwov-resources/image/common/icon/favicon.ico"
          },
          {
            "url": "https://www.hongkongairport.com/en/passenger-guide/airport-facilities-services/shower-facilities",
            "title": "Complimentary Shower Facilities, Airport Facilities & Services - Hong Kong International Airport",
            "favicon": "https://www.hongkongairport.com/iwov-resources/image/common/icon/favicon.ico"
          }
        ]
      },
      "q16": {
        "question": "Are there accessible services or children's facilities at the Houston and Hong Kong airports?",
        "answer": "Houston's George Bush Intercontinental Airport offers wheelchair assistance arranged through your airline, a Sunflower Lanyard program for hidden disabilities, a sensory room, TSA Cares support, and accessible parking and restrooms. Hong Kong International Airport provides complimentary wheelchair service via your airline or a paid option through ALLWAYS (+852 2275 0000), barrier-free facilities like tactile guide paths and Caring Corners, plus nursing rooms and infant stroller services for families. At both airports, passengers should contact their airline in advance—ideally 48 hours or more before departure—to arrange mobility assistance or special services.",
        "toolsUsed": [
          "article_lookup"
        ],
        "references": [
          {
            "url": "https://fly2houston.com/iah/accessibility",
            "title": "IAH Accessibility Services | ADA Accessible Travel at Houston Airport"
          },
          {
            "url": "https://fly2houston.com/iah/related-content/accessibility-services-at-george-bush-intercontinental-airport",
            "title": "Accessibility Services at George Bush Intercontinental Airport Your Complete Guide to Accessible Travel at IAH"
          },
          {
            "url": "https://fly2houston.com/iah/accessibility/accessible-security-screening",
            "title": "IAH Accessible Security Screening | Assisted TSA Screening at George Bush Intercontinental Airport"
          },
          {
            "url": "https://en.wikipedia.org/wiki/Bush_Intercontinental_Airport",
            "title": "George Bush Intercontinental Airport - Wikipedia",
            "time_published": "2026-03-12T23:18:47Z"
          },
          {
            "url": "https://www.hongkongairport.com/en/passenger-guide/airport-facilities-services/special-needs-access",
            "title": "Special Needs Access",
            "favicon": "https://www.hongkongairport.com/iwov-resources/image/common/icon/favicon.ico"
          },
          {
            "url": "https://hongkongairport.com/en/passenger-guide/departures/special-needs-access.page",
            "title": "Special Needs Access, Departures - Hong Kong International Airport",
            "favicon": "https://hongkongairport.com/iwov-resources/image/common/icon/favicon.ico"
          },
          {
            "url": "https://www.hongkongairport.com/en/passenger-guide/airport-facilities-services/mobility-assistance",
            "title": "Mobility Assistance, Airport Facilities & Services - Hong Kong International Airport",
            "favicon": "https://www.hongkongairport.com/iwov-resources/image/common/icon/favicon.ico"
          },
          {
            "url": "https://hongkongairport.com/en/passenger-guide/airport-facilities-services",
            "title": "Airport Facilities and Services, Passenger Guide - Hong Kong International Airport",
            "favicon": "https://hongkongairport.com/iwov-resources/image/common/icon/favicon.ico"
          }
        ]
      },
      "q17": {
        "question": "What aircraft are typically used on flights from Houston to Hong Kong?",
        "answer": "There is no nonstop service from Houston to Hong Kong; connections route through hubs like San Francisco, Los Angeles, Chicago, Dallas, Seattle, and Tokyo. On the long-haul leg, United uses Boeing 777-300ERs and 787-9s, Cathay Pacific uses 777-300ERs, A350-1000s, A350-900s, and 777-300s, and ANA uses 787-9s. Short connecting legs are flown on various narrowbody and regional jets, including Boeing 737s, Airbus A320-family aircraft, Embraer 175s, and Canadair Regional Jets.",
        "methodology": "Aircraft types come from our flight-schedule database, which combines published airline timetables, U.S. government schedule data from the Bureau of Transportation Statistics (BTS), and observed flight operations from the EUROCONTROL/OpenSky Open Performance Data Initiative (OPDI). For U.S. routes the type is grounded in the tail number that actually operated the flight; elsewhere it comes from the airline's filed equipment code. Where the source does not commit to a specific variant we name the aircraft family (for example Airbus A320 family) rather than guess, and where no reliable type is on file the aircraft is omitted rather than estimated. Types describe typical scheduled equipment and can vary with seasonal or day-of-week assignments and last-minute swaps.",
        "toolsUsed": [
          "route_aircraft"
        ]
      },
      "q18": {
        "question": "Which airline alliances serve flights from Houston to Hong Kong?",
        "answer": "Star Alliance (via United, EVA Air, Air Canada, or ANA connecting through cities like SFO, LAX, TPE, YVR, HND, or NRT) and oneworld (via Cathay Pacific through SEA, DFW, LAX, or ORD) serve flights from Houston to Hong Kong, with no SkyTeam or unaligned carriers on the route.",
        "methodology": "Airlines and weekly frequencies are compiled from our flight-schedule database, which combines published airline timetables, U.S. government schedule data from the Bureau of Transportation Statistics (BTS), and observed flight operations from the EUROCONTROL/OpenSky Open Performance Data Initiative (OPDI). We count each operating carrier's scheduled weekly departures and the days it flies; where there is no nonstop service, connecting carriers are identified by linking scheduled nonstop segments through common hub airports. Where a median fare is shown for a carrier, it reflects the real fares Priceline users found on this route in the last 72 hours.",
        "toolsUsed": [
          "route_airlines"
        ]
      },
      "q20": {
        "question": "What are the best airport lounge options when departing from Houston?",
        "answer": "When departing from Houston, the KLM Crown Lounge and Air France Lounge in Terminal D are available, with the Air France Lounge offering complimentary alcoholic and soft drinks, air conditioning, disabled access, and a maximum three-hour stay. Both lounges are located after security and passport control, with the Air France Lounge opposite Gate D18B.",
        "toolsUsed": [
          "article_lookup"
        ],
        "references": [
          {
            "url": "https://my.prioritypass.com/en-GB/lounges/united-states-of-america/george-bush-intercontinental",
            "title": "George Bush Intercontinental Airport - Houston IAH Lounges - IAH Airport Guide and lounges. | Priority Pass",
            "favicon": "https://my.prioritypass.com/icon.png?icon.1k7202wk2zqql.png?dpl=1f82db4e-b1f8-481b-b911-c24ef915cc46"
          },
          {
            "url": "https://americanexpress.com/en-us/travel/lounges/the-platinum-card/IAH",
            "title": "American Express Lounges at George Bush Intercontinental Airport | Amex US",
            "favicon": "https://www.americanexpress.com/apple-touch-icon-152x152.png"
          },
          {
            "url": "https://prioritypass.com/en-GB/lounges/united-states-of-america/george-bush-intercontinental/iah7-air-france-lounge",
            "title": "Air France Lounge IAH AIRPORT Terminal D Houston TX George Bush Intercontinental | Priority Pass",
            "favicon": "https://prioritypass.com/icon.png?icon.1k7202wk2zqql.png?dpl=516920c0-0ba4-4888-ba2e-135e5e839cd3"
          },
          {
            "url": "https://prioritypass.com/en-GB/lounges/united-states-of-america/george-bush-intercontinental",
            "title": "George Bush Intercontinental Airport - Houston IAH Lounges - IAH Airport Guide and lounges. | Priority Pass",
            "favicon": "https://prioritypass.com/icon.png?a4ff481221414a5c",
            "time_published": "2026-06-30T08:24:25Z"
          },
          {
            "url": "https://www.aa.com/web/i18n/travelInformation/destinationInformation/iah-airport.html",
            "title": "Houston George Bush Intercontinental Airport, TX (IAH)",
            "favicon": "https://www.aa.com/content/images/chrome/rebrand/favicon.png"
          }
        ]
      },
      "q21": {
        "question": "What is the baggage allowance on this route from Houston to Hong Kong?",
        "answer": "Baggage rules on Houston–Hong Kong flights depend on the airline and fare class. Basic Economy often excludes a checked bag, while standard economy typically includes one checked bag and a carry‑on. Premium cabins and elite status provide additional allowances."
      },
      "q22": {
        "question": "What cabin and seat options are typical from Houston to Hong Kong?",
        "answer": "Flights from Houston to Hong Kong typically offer Economy and flat‑bed Business class, while Premium Economy is available on select airlines."
      },
      "q23": {
        "question": "Are same‑day changes or standby possible on this route?",
        "answer": "Same‑day changes and standby depend on the airline and fare class; flexible and premium tickets often permit them, while restrictive fares rarely do."
      }
    }
  }
}