{"response": {"Key": "CLT-WAS", "orig": {"code": "CLT", "type": "airport", "city": "Charlotte", "fullCity": "Charlotte, North Carolina", "airport": "Douglas Intl Airport"}, "dest": {"code": "WAS", "type": "airport", "city": "Washington", "fullCity": "Washington, United States", "airport": "Ronald Reagan National Airport"}, "faq": {"q0": {"question": "What is the typical flight duration from Charlotte to Washington?", "answer": "The flight from Charlotte to Washington is about 330 miles and typically takes 1 hour 29 minutes. The return trip averages 1 hour 34 minutes, a difference of just 5 minutes.", "methodology": "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.", "toolsUsed": ["flight_schedule"]}, "q1": {"question": "Are there any direct flights from Charlotte to Washington?", "answer": "Yes, American Airlines and United offer daily nonstop flights from Charlotte to Washington. American serves both Reagan National (DCA) and Dulles (IAD) with roughly 115 weekly flights to DCA and about 78 to IAD (including regional affiliates), while United flies to IAD with about 54 weekly flights. Service runs every day of the week on all routes.", "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"]}, "q3": {"question": "What are the ground transportation options in Washington?", "answer": "At Washington Dulles (IAD), you can take the Silver Line Metrorail into the city by riding the Silver Line Express bus to the Wiehle-Reston East station — the train runs to downtown, though not overnight. Taxis from Washington Flyer are available 24/7 and offer a direct, door-to-door option, while ride-share services like Uber and Lyft also pick up at the airport. Shared vans through SuperShuttle or Supreme Shuttle provide a lower-cost group alternative. The Metrorail is the most-used option for its balance of cost and reliability, but a taxi or ride-share is typically fastest outside of rush hour.", "toolsUsed": ["article_lookup"], "references": [{"url": "https://flydulles.com/flight-schedule-dulles-international-airport-iad", "title": "flydulles.com - Flight Schedule - Dulles International Airport (IAD)", "time_published": "2022-03-01T00:00:00Z"}, {"url": "https://parking.flydulles.com/economy-parking", "title": "Dulles International Airport Parking | Economy Parking", "time_published": "2026-02-06T00:00:00Z"}, {"url": "https://www.mwaa.com/ipw-2017-archived", "title": "IPW 2017 - Archived", "time_published": "2021-02-01T00:00:00Z"}, {"url": "https://www.mwaa.com/policefireems/fire-ems/fire-ems-washington-dulles-international-airport", "title": "mwaa.com - Fire & EMS at Washington Dulles International Airport", "favicon": "https://www.mwaa.com/themes/custom/mwaa_barrio/favicon.ico", "time_published": "2023-09-01T00:00:00Z"}, {"url": "https://en.wikipedia.org/wiki/Dulles%20International%20Airport", "title": "Dulles International Airport", "time_published": "2026-04-30T14:07:38Z"}]}, "q4": {"question": "When is the cheapest time to fly from Charlotte to Washington?", "answer": "The cheapest months to fly from Charlotte to Washington are October, July, and September, with average fares as low as $194 in October. The most expensive months are November, August, and June, with average fares peaking at $338 in November.", "methodology": "This 'good deal' estimate shows a representative best price for each departure date across roughly a 12-month window (about 3 months back and 9 months forward). It is built from real flight prices found by Priceline users searching this route, accumulated into a price history for each departure date. Rather than weighting all of that history equally, we apply exponential time decay so recent prices dominate — a price seen yesterday counts almost in full, one from about a month ago roughly a third, and prices from a few months back very little — giving a figure that tracks today's market instead of a stale long-run average. Clear price outliers are removed before any calculation, departure dates with no observations are filled in from nearby dates, and the resulting curve is lightly smoothed so it reads as a clean seasonal trend rather than day-to-day noise.", "toolsUsed": ["seasonal_prices"]}, "q5": {"question": "How far in advance should I book tickets from Charlotte to Washington?", "answer": "For flights from Charlotte to Washington, the best fares are typically found when booking 7 to 10 weeks before departure, with an average price around $182. Extremely early booking around 175 days out can occasionally yield the lowest fare of $162, while last-minute tickets and bookings around 145 days ahead tend to be much more expensive. During peak summer and holiday periods, demand drives prices higher, so aiming for the earlier end of that 7-10 week window is advisable.", "methodology": "This booking-window guidance is built from the same real flight prices found by Priceline users searching this route, re-grouped by how many days before departure each price was seen (from the departure day out to about 180 days ahead) across the route's price history. At each booking lead time we report the 25th-percentile price — the cheaper end of what travelers were quoted, rather than the rock-bottom minimum (which can be a fluke) or the average (which is pulled up by expensive last-minute fares). The buy-or-wait advice then applies a risk premium that grows as departure approaches, since seat availability shrinks and prices become less predictable; using that adjusted curve we flag windows where waiting is likely to save a meaningful amount (at least $20 or 5%) versus windows where booking now is the better call. Isolated single-day recommendations are filtered out, so the advice only reflects a window that holds for several days in a row.", "toolsUsed": ["booking_timing"]}, "q6": {"question": "Are overnight (red‑eye) flights available from Charlotte to Washington?", "answer": "Yes, overnight red‑eye flights are available from Charlotte to Washington. American Airlines operates daily nonstop red‑eyes to both Reagan National (DCA) and Dulles (IAD), with departures typically between 9:14 PM and 10:36 PM and arrivals around 10:03 PM to midnight the same evening. PSA Airlines (operating as American Eagle) also runs daily red‑eyes to both airports, departing around 10:25 PM and arriving just before midnight.", "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. 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.", "toolsUsed": ["redeye_flights", "flight_schedule"]}, "q7": {"question": "Which airlines usually operate this route from Charlotte to Washington?", "answer": "American Airlines and United are the non‑stop carriers from Charlotte to Washington. American operates up to 115 weekly flights to Ronald Reagan Washington National (DCA) and another 59 to Washington Dulles (IAD) under the American Eagle brand operated by PSA Airlines, plus 19 mainline flights to IAD. United flies 47 weekly flights to IAD operated by Republic Airways as United Express and 7 mainline flights to IAD. Fares are not provided for this 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"]}, "q8": {"question": "If I need a connection, what are common layover cities between Charlotte and Washington?", "answer": "Charlotte to Washington is typically a short nonstop flight, so connections are uncommon and add unnecessary time. If you still need a layover, Atlanta or Philadelphia can work but will make the trip longer."}, "q9": {"question": "How reliable are on‑time arrivals on this route from Charlotte to Washington?", "answer": "On the Charlotte to Washington route, on‑time arrival reliability ranges from 67% on American to 87% on Republic (operating as United Express), with cancellation rates between 0% and 2.4%. The most reliable carrier is Republic (YX), with 86.9% of flights arriving within 15 minutes of schedule.", "methodology": "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.", "toolsUsed": ["flight_schedule"]}, "q10": {"question": "Which months have the best weather for traveling to Washington?", "answer": "April to May and September to October offer pleasant temperatures and fewer tourists than summer."}, "q11": {"question": "What documents should I bring with me to the airport when flying from Charlotte to Washington?", "answer": "For this domestic U.S. flight, bring a Real ID-compliant driver's license or a passport, ensure the name matches your ticket, and have a payment method ready for baggage. No visas or vaccination certificates are required for this route."}, "q12": {"question": "Which airport should I use in Washington?", "answer": "Washington has three airports. Reagan National is closest to downtown and the National Mall, ideal for business and short‑haul flights. Dulles is farther out, a major international gateway with more long‑haul options. Baltimore‑Washington is the farthest, often used by low‑cost carriers."}, "q13": {"question": "How do I get to Douglas Intl Airport from the city center?", "answer": "From downtown Charlotte, the most popular option is a taxi or ride‑share like Uber or Lyft, which takes about 15–20 minutes and costs roughly $25–$35. A cheaper alternative is the CATS Sprinter bus (Route 5), which runs from the Charlotte Transportation Center in Uptown to the airport in around 30 minutes for a few dollars. Driving yourself and parking is also possible, with on‑airport lots and decks available, though rates vary by duration.", "toolsUsed": ["article_lookup"], "references": [{"url": "https://www.cltairport.com/to-and-from/", "title": "Ground Transportation - Charlotte Douglas International Airport", "time_published": "2026-04-07T00:00:00Z"}, {"url": "https://cltairport.com/airport-info/accessibility/accessible-parking/accessible-ground-transportation/", "title": "Accessible Ground Transportation - Charlotte Douglas International Airport", "favicon": "https://cltairport.com/cltairport.png", "time_published": "2026-03-09T15:43:51Z"}, {"url": "https://en.wikipedia.org/wiki/Transportation%20in%20Charlotte%2C%20North%20Carolina", "title": "Transportation in Charlotte, North Carolina", "time_published": "2026-03-21T17:16:29Z"}, {"url": "https://en.wikipedia.org/wiki/Transportation_in_Charlotte,_North_Carolina", "title": "Transportation in Charlotte, North Carolina", "time_published": "2026-03-21T17:16:29Z"}, {"url": "https://www.faa.gov/AIR_TRAFFIC/FLIGHT_INFO/AERONAV/PROCEDURES/application/index.cfm?event=directory&directory=69671A4500874A0E99D7298A6E848342-CLT-NDBR&type=ndbr&nasrId=CLT", "title": "USA Banner", "time_published": "2025-06-26T00:00:00Z"}]}, "q14": {"question": "Are there hotels or sleeping facilities at Washington airport?", "answer": "Washington Dulles International Airport (IAD) has the Sleepbox Lounge airside, offering 16 sound-proof rooms for rest, though there are no designated free rest zones or sleeping pods in the terminals. The on-site Washington Dulles Airport Marriott is connected by a free shuttle that runs every 15 minutes, providing a full-service hotel option. Several other nearby hotels also offer shuttle service, but no capsule hotels or in-terminal sleeping facilities are available beyond the Sleepbox Lounge.", "toolsUsed": ["article_lookup"], "references": [{"url": "https://sleepinginairports.net/guides/washington-dulles-airport-guide.htm", "title": "Washington Dulles Airport Guide (IAD) - 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": "2018-08-08T21:11:21Z"}, {"url": "https://www.sleepinginairports.net/sleep-guide/sleeping-in-washington-dulles-airport.htm", "title": "Sleeping in Washington Dulles Airport", "time_published": "2024-09-12T00:00:00Z"}, {"url": "https://www.marriott.com/en-us/hotels/iadap-washington-dulles-airport-marriott/overview/?scid=d2406702-e8ea-4b45-bb9b-69", "title": "Hotel near IAD Airport | Washington Dulles Airport Marriott", "time_published": "2025-02-19T00:00:00Z"}, {"url": "https://www.marriott.com/en-us/hotels/iadap-washington-dulles-airport-marriott/overview/?scid=f2ae0541-1279-4f24-b197-a979c79310b0", "title": "Hotel near IAD Airport | Washington Dulles Airport Marriott", "time_published": "2024-10-11T00:00:00Z"}, {"url": "https://www.flydulles.com/", "title": "Official Website of Washington Dulles International Airport - IAD", "favicon": "https://www.flydulles.com/themes/custom/mwaa_barrio/favicon.ico", "time_published": "2026-07-17T00:00:00Z"}, {"url": "https://www.airportsdata.net/airport-IAD-accommodation/", "title": "Sleeping at Dulles airport - Washington D.C.", "time_published": "2025-12-01T00:00:00Z"}]}, "q15": {"question": "Are there currency exchange offices, prayer rooms and Wi‑Fi at Ronald Reagan National Airport?", "answer": "Washington Dulles International Airport (IAD) offers international currency exchange, free Wi‑Fi, and an interfaith chapel. Currency exchange is available in the terminal. Free Wi‑Fi is provided throughout the airport. The interfaith chapel is located in the terminal.", "toolsUsed": ["article_lookup"], "references": [{"url": "https://www.flydulles.com/dulles-international-airport-nominated-2024-usa-todays-10best-shopping-large-airport-lounge", "title": "Dulles International Airport Nominated for 2024 USA Today’s ‘10Best’ Shopping, Large Airport & Lounge | flydulles.com", "time_published": "2022-03-01T00:00:00Z"}, {"url": "https://flydulles.com/about-dulles-international", "title": "flydulles.com - About Dulles International", "time_published": "2022-03-01T00:00:00Z"}, {"url": "https://mwaa.com/iad-rfi", "title": "mwaa.com - US DOT Request for Information to Revitalize Washington Dulles International Airport", "favicon": "https://mwaa.com/themes/custom/mwaa_barrio/favicon.ico"}, {"url": "https://mwaa.com/alert/rfi-revitalize-dulles-international-airport", "title": "mwaa.com - US DOT Request for Information to Revitalize Washington Dulles International Airport", "favicon": "https://mwaa.com/themes/custom/mwaa_barrio/favicon.ico"}, {"url": "https://en.wikipedia.org/wiki/Dulles%20International%20Airport", "title": "Dulles International Airport", "time_published": "2026-04-30T14:07:38Z"}]}, "q16": {"question": "Are there accessible services or children's facilities at the Charlotte and Washington airports?", "answer": "Charlotte Douglas International Airport (CLT) provides accessible shuttle buses, rental cars, and taxis, with advance reservations recommended at least 48 hours ahead; passengers can request accommodations through the ADA Coordinator. Ronald Reagan Washington National Airport (DCA) offers wheelchair-accessible taxis and encourages contacting the dispatch office 24 hours in advance for pre-arranged service, while general ADA inquiries go to the Airports Authority's coordinator. Both airports are committed to accessibility and nondiscrimination, but specific children's play areas are not detailed in the available information.", "toolsUsed": ["article_lookup"], "references": [{"url": "https://cltairport.com/airport-info/accessibility/accessible-parking/accessible-ground-transportation/", "title": "Accessible Ground Transportation - Charlotte Douglas International Airport", "favicon": "https://cltairport.com/cltairport.png", "time_published": "2026-03-09T15:43:51Z"}, {"url": "http://www.cltairport.com/airport-info/accessibility/", "title": "Accessibility and Nondiscrimination - Charlotte Douglas International Airport", "favicon": "http://www.cltairport.com/cltairport.png", "time_published": "2026-03-09T15:41:04Z"}, {"url": "https://en.wikipedia.org/wiki/Charlotte_Army_Airbase", "title": "Charlotte Douglas International Airport", "favicon": "https://en.wikipedia.org/static/apple-touch/wikipedia.png", "time_published": "2003-07-10T01:30:25Z"}, {"url": "https://en.wikipedia.org/wiki/Charlotte/Douglas_International_Airport", "title": "Charlotte Douglas International Airport - Wikipedia", "time_published": "2003-07-10T00:00:00Z"}, {"url": "https://www.faa.gov/air_traffic/flight_info/aeronav/procedures/application/index.cfm?event=directory&directory=6AF926197A2A4001802409F21DDE437A-CLT&type=acifp&nasrId=CLT", "title": "USA Banner", "time_published": "2025-06-26T00:00:00Z"}, {"url": "https://en.wikipedia.org/wiki/Ronald%20Reagan%20Washington%20National%20Airport", "title": "Ronald Reagan Washington National Airport", "time_published": "2026-04-22T18:33:09Z"}, {"url": "https://www.flyreagan.com/dca/services-patrons-disabilities", "title": "flyreagan.com - Services for Patrons with Disabilities", "favicon": "https://www.flyreagan.com/themes/custom/mwaa_barrio/favicon.ico"}, {"url": "https://flyreagan.com/parking-transportation/taxi-service", "title": "flyreagan.com - Taxi Service", "favicon": "https://flyreagan.com/themes/custom/mwaa_barrio/favicon.ico"}, {"url": "https://en.wikipedia.org/wiki/Ronald%20Reagan%20Washington%20National%20Airport%20station", "title": "Ronald Reagan Washington National Airport station", "time_published": "2026-04-07T00:26:26Z"}, {"url": "https://www.mwaa.com/policies-regulations/civil-rights-patrons/ada-rehab-act-notice", "title": "mwaa.com - ADA Rehab Act Notice", "time_published": "2021-08-01T00:00:00Z"}]}, "q17": {"question": "What aircraft are typically used on flights from Charlotte to Washington?", "answer": "The most common aircraft on nonstop flights from Charlotte to Washington are the Boeing 737-800, Airbus A320 family (A320-100 and A319), and Embraer 175, with American Airlines and United operating the bulk of the service and Southwest also flying the Boeing 737 MAX 8 on this route. Canadair Regional Jet 700 and 900 models also appear, and the exact aircraft can vary by day and airline. Wi-Fi and seatback entertainment are widely available on these routes, though specifics differ by carrier and aircraft.", "methodology": "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_aircraft"]}, "q18": {"question": "Which airline alliances serve flights from Charlotte to Washington?", "answer": "American Airlines (oneworld) and United Airlines (Star Alliance) operate nonstop flights from Charlotte to Washington. No other alliances have nonstop service on this route, though they may offer connecting itineraries.", "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 Charlotte?", "answer": "Charlotte Douglas International Airport (CLT) offers several lounge options. The American Express Centurion Lounge is located in the Main Terminal, Concourse D/E, and is accessible to Platinum Card members, Centurion members, and their guests, featuring complimentary food and cocktails. The Club CLT in Concourse A is open daily from 5:00 AM to 9:30 PM and accepts Priority Pass memberships, with amenities including a children's play area and showers for a fee. A Delta Sky Club is also listed in Concourse A, available to eligible Delta passengers. Additionally, Minute Suites are available in the Main Atrium and the Concourse D/E Connector for those seeking private rest spaces.", "toolsUsed": ["article_lookup"], "references": [{"url": "https://americanexpress.com/en-us/travel/lounges/the-platinum-card/CLT", "title": "American Express Lounges at Charlotte Douglas International Airport | Amex US", "favicon": "https://www.americanexpress.com/apple-touch-icon-152x152.png"}, {"url": "https://americanexpress.com/en-us/travel/lounges/the-platinum-card/CLT/the-club-clt-main-terminal-concourse-a-yio41B7H6z", "title": "The Club CLT at Charlotte Douglas International Airport | Amex US", "favicon": "https://www.americanexpress.com/apple-touch-icon-152x152.png"}, {"url": "https://my.prioritypass.com/en-GB/lounges/united-states-of-america/charlotte-douglas-international/clt5-the-club-clt", "title": "The Club CLT CLT AIRPORT Concourse A Charlotte Douglas International | Priority Pass", "time_published": "2024-11-05T00:00:00Z"}, {"url": "https://www.cltairport.com/", "title": "Charlotte Douglas International Airport", "favicon": "https://www.cltairport.com/cltairport.png", "time_published": "2025-05-27T14:52:48Z"}, {"url": "https://prioritypass.com/lounges/usa/charlotte-nc-douglas-intl", "title": "Charlotte-Douglas International Airport CLT Lounges - CLT Airport Guide and lounges.  | Priority Pass", "time_published": "2024-11-05T00:00:00Z"}]}, "q21": {"question": "What is the baggage allowance on this route from Charlotte to Washington?", "answer": "On this domestic route, baggage policies depend on the airline and fare class. Basic economy fares often charge for both checked and carry-on bags, while standard economy typically includes a carry-on and personal item, with checked bags available for a fee."}, "q22": {"question": "What cabin and seat options are typical from Charlotte to Washington?", "answer": "Flights from Charlotte to Washington typically offer Economy and sometimes standard Business class with larger seats, but flat‑bed Business and Premium Economy are not common on this short domestic route."}, "q23": {"question": "Are same‑day changes or standby possible on this route?", "answer": "Policies differ by airline and fare class; flexible tickets and premium cabins typically offer same‑day changes or standby, while Basic Economy generally does not."}}}}