Avoid airline fee traps before you book or fly
Check baggage rules, fare restrictions, sizer risk, and card break-even calculations before an airline's cheapest fare turns into the expensive one.
Popular reference topics
Start with the topic that matches the fee or fare restriction you are trying to verify.
First-bag, second-bag, and airport-versus-prepaid baggage references.
Cabin-bag and personal-item rules, including stricter low-cost models.
Carry-on, seat, and change-rule differences across entry fare types.
Checked-bag benefit rules by airline card family and traveler coverage.
Piece versus weight concept, fare family, and route-based allowance traps.
Official-reference pages for cancellations, delays, and refund rules.
Turn baggage rules into trip math
Use deterministic tools when the question is not just what the rule says, but what the likely charge does to the real fare.
Avoid landing without data
For international flights, a travel eSIM is worth considering when you need maps, rideshare, lodging messages, or airline rebooking tools immediately after arrival.
Check the travel eSIM decision guideAirline directory
A sample of the 82 indexed carriers.