Airlines cancellation and change flight

American Airlines Change Flight or American Airlines Cancellation Policy: American Airlines has eliminated virtually all fees when you cancel a flight or change a flight.

Air Canada Cancellation Policy : Air Canada does not allow flight changes for those with basic economy tickets after the initial 24-hour window. .

Delta Cancellation Policy- Delta Cancellations policy for non-refundable tickets allows passengers to cancel their tickets within a day of flight booking without paying any fee.

https://aviationrepublic.com/blog/american-airlines-change-flight-date-policy-fee-reschedule-booking/