The Same Heavy, Oversized Bag Can Cost Different Amounts

Sources checked October 31, 2026. Match the fare, route, and ticket date to your own booking before you pay.

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Do not use one universal excess-fee formula

Take one ordinary suitcase weighing 55 lb and measuring 66 linear inches. Assume a U.S. mainland/domestic itinerary, the first checked bag, no benefits or special-item exception, and the specific current fare/date conditions in the examples below.

These are baggage-only comparisons, not flight-price comparisons. Taxes, acceptance restrictions and special equipment are not silently assumed away.

Why a generic calculator fails

Adding everything would overstate the American example. Taking only the larger surcharge would understate the Delta example. Southwest supplies a specific combined row rather than requiring the user to reconstruct it from the two individual rows.

The site should therefore store a carrier-specific combination rule and explain the arithmetic in the result. It should check refusal limits first: an unaccepted bag does not become acceptable just because a fee can be calculated.

Your next step

Check your bag’s ordinal number and actual free allowance, then verify the airline’s applicable table. If your bag is sports equipment or a musical instrument, stop using this ordinary-suitcase example and open the relevant special-item policy.

Sources and verification

• AA_BASE — American Airlines: Checked bag fees and policies
• AA_EXCESS — American Airlines: Oversize and overweight bags
• DL_BASE — Delta Air Lines: Baggage overview
• DL_EXCESS — Delta Air Lines: Excess, overweight and oversized baggage
• SW_FEES — Southwest Airlines: Optional Travel Charges

The examples above show how the cited rules work. They aren’t charges from a real booking.

Related answers

• Free bag does not mean free excess
• Dispute a baggage charge

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