American Airlines Cancellation Policy, United Cancellation Policy United And American Airlines is no exception to the 24-hour flexible booking policy. You may cancel or change any flight within 24 hours without incurring additional costs.
Air Canada Cancellation Policy you have up to 24 hours after booking to cancel your ticket for any reason and receive a full refund with no change or cancellation fees.
Southwest Airlines Fees Southwest Airlines flight change policy is simple: no change fees if you need to modify your flight reservation
https://aviationrepublic.com/blog/air-Canada-cancellation-policy-how-to-cancel-an-air-canada-flight-booking/
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https://aviationrepublic.com/blog/southwest-airlines-flight-change-cancellation-and-other-fees-all-you-need-to-know/