Originally Posted by Often1

The error was that OP did not properly check it in as AC's rules require. The maximum longest dimension is 21.5" (x9x15.5). Whether the bag fits in a particular bin is wholly irrelevant. Perhaps had the bag carried an automated rather than manual tag resulting from the FA having to enforce the rules, it would not have been delayed.

OP will have to look far and wide for a US carrier which permits a 24" bag.