The cost of missing the weight target is disproportionately steep. Crossing from 50.1 to 51 pounds does not trigger an incremental five-dollar fee; it dumps the passenger straight into the secondary tier of heavy luggage pricing, which universally starts at $100.
| Airline / Alliance | Published Weight Limit | Metric Equivalent | Overweight Surcharge (Tier 1) |
|---|---|---|---|
| Delta Air Lines | 50 lbs (Domestic US) | 22.68 kg | $100 (51, 70 lbs) |
| United Airlines | 50 lbs (Domestic US) | 22.68 kg | $100, $200 (51, 70 lbs) |
| British Airways | 23 kg (Standard Economy) | 50.71 lbs | £65 / $75 (23, 32 kg) |
| Lufthansa | 23 kg (Economy Classic) | 50.71 lbs | €50, €120 (23, 32 kg) |
| Air France | 23 kg (Standard Economy) | 50.71 lbs | $85, $150 (23, 32 kg) |
| Singapore Airlines | 23 kg (Economy per piece) | 50.71 lbs | $75, $150 per heavy bag |
The fee structure shows that airlines do not view excess baggage weight as a line-item utility charge. It acts as an operational barrier. An additional pound of checked weight costs pennies in jet fuel burn, yet airlines levy three-digit fines because processing overweight baggage disrupts baggage handling velocity and strains loading personnel.
