US carriers must let you cancel without penalty for at least 24 hours if you booked one week or more before departure.

A 3-hour domestic or 6-hour international change counts as significant and triggers an automatic refund if you decline the alternative.

UK compensation is fixed by distance at 220, 350 or 520 pounds per person and is not linked to what you paid for the ticket.

Airlines must refund the checked bag fee if the bag arrives more than 12 hours late on a domestic US itinerary.

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