[_delirium]

If you're comparing round-trip ticket prices, you should double the carry-on fee for comparison purposes, since the airlines that charge fees for carry-ons typically charge it on both outgoing and return legs.

Spirit is an American low-cost carrier with fees in that range. It's $56 roundtrip for a carry-on bag if paid for at booking time, $76 if paid online after booking, or $114 if paid at the airport in person.