Image Source / Alamy

Travel Fee: Carry-on Baggage

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The Cost: $30 online; $45 at the gate.

How to Avoid It: So far, only Spirit Airline charges for carry-on bags on domestic flights. But even on Spirit, if the bag measures no more than 16 x 14 x 12 (think computer bag) and can fit under your airline seat, it’s still free. If your bag is bigger, then fly another airline. Other carriers haven’t jumped on this particular revenue stream…yet.

Most Annoying Travel Fees 2011

Travel Fee: Carry-on Baggage

The Cost: $30 online; $45 at the gate.

How to Avoid It: So far, only Spirit Airline charges for carry-on bags on domestic flights. But even on Spirit, if the bag measures no more than 16 x 14 x 12 (think computer bag) and can fit under your airline seat, it’s still free. If your bag is bigger, then fly another airline. Other carriers haven’t jumped on this particular revenue stream…yet.

Image Source / Alamy

Most Annoying Travel Fees 2011

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