If the departure date is within one week of the reservation date, the airline's 24-hour limit does not apply. The number of days in the cancellation period is important in determining the cost.

There is no cancellation fee if a passenger who has purchased a non-refundable ticket wishes to cancel the key on the day of booking.

Passengers with Frontier's works plan are eligible for a refund according to the airline's 24-hour cancellation policy. Passengers can use the portal to get a refund for more on British airways cancellation policy follow the provided link.
https://www.cancellation-policy.com/british-airways-cancellation-policy