https://airlinehelplinesupport.zohodesk.com/portal/en/kb/articles/ensure-process-what-is-the-free-cancellation-policy-for-united-airlines
https://airlinehelplinesupport.zohodesk.com/portal/en/kb/articles/united-faqs-does-united-reimburse-for-cancelled-flights
https://airlinedirectconnect.zohodesk.com/portal/en/kb/articles/american-ticketupdate-is-it-free-to-change-flights-on-american-airlines
https://airlinedirectconnect.zohodesk.com/portal/en/kb/articles/american-flightedit-can-i-change-my-flight-with-american-airlines
https://airlinedirectconnect.zohodesk.com/portal/en/kb/articles/american-flightmodify-can-i-make-changes-to-my-united-airlines-flight
https://airlinedirectconnect.zohodesk.com/portal/en/kb/articles/american-passengeredit-can-i-change-a-flight-i-already-booked-with-united
https://airlinedirectconnect.zohodesk.com/portal/en/kb/articles/expedia-nameupdate-can-i-change-flights-on-expedia
https://airlinedirectconnect.zohodesk.com/portal/en/kb/articles/expedia-ticket-modify-does-expedia-allow-date-change
https://airlinedirectconnect.zohodesk.com/portal/en/kb/articles/expedia-reservationfix-can-i-change-a-flight-booked-through-expedia
https://airlinedirectconnect.zohodesk.com/portal/en/kb/articles/qatar-namefix-can-i-change-my-qatar-airways-flight