14 Things Airlines Can Do to You That Are Completely Legal — And the 3 That Aren’t

We may earn money or products from the companies mentioned in this post. This means if you click on the link and purchase the item, I will receive a small commission at no extra cost to you ... you're just helping re-supply our family's travel fund.

Most air travel complaints are about things airlines are legally permitted to do. Overbooking, gate changes, equipment swaps, and schedule changes are all within the airline’s legal rights under their published Contract of Carriage. Knowing what’s legal and what isn’t changes how you react when something goes wrong — because the situations where you have real leverage are specific, and the situations where you don’t are more common than most travelers realize.

14 Things Airlines Can Legally Do

1. Overbook a flight

Overbooking is legal and universal among major carriers. Airlines sell more seats than exist because historical no-show rates make this economically rational. When everyone shows up and there aren’t enough seats, the airline must first ask for volunteers before involuntarily bumping passengers.

2. Involuntarily bump you (with compensation)

If not enough volunteers accept the offer, the airline can involuntarily deny boarding — but must provide cash compensation determined by the length of delay you experience. The DOT mandates minimum compensation amounts. This is legal and the compensation requirements are real.

3. Change your flight time up to the day before departure

Airlines can change schedule times within certain windows and don’t have to refund non-refundable tickets for minor schedule changes. “Significant” changes (DOT’s rule considers 3+ hours a significant change) trigger refund rights. Minor changes don’t.

4. Swap to a smaller aircraft

If your seat class still exists on the new plane and you’re rebooked in an equivalent seat, the airline is within its rights. If you booked a lie-flat business class seat and the replacement aircraft doesn’t have them, you may be entitled to a refund of the fare difference.

5–14 (additional legally permitted actions):

• 5. Change your gate any number of times without compensation
• 6. Charge for checked bags — including on round-trip tickets purchased before fee increases (fees apply at time of travel)
• 7. Combine your routing with additional stops
• 8. Deny boarding to passengers who arrive late, even within the published check-in window
• 9. Remove your frequent flyer miles for account inactivity or terms violations
• 10. Devalue their loyalty program at any time
• 11. Charge overhead bin fees on their lowest fare class
• 12. Keep your non-refundable fare if you miss your flight for any reason
• 13. Remove a passenger from a flight for behavior that the crew deems disruptive
• 14. Refuse to rebook you on a competitor’s flight even when your flight is canceled (in most circumstances)

The 3 Things Airlines Cannot Legally Do

1. Keep your money after a significant schedule change or cancellation

The DOT’s 2024 refund rule clarified and strengthened the requirement: if an airline cancels your flight or makes a “significant change” (3+ hour delay, 1+ connection added, downgrade in cabin class, change to a different origin or destination airport), you are entitled to a full cash refund — not a voucher — if you choose not to accept the change. Airlines must proactively offer this refund; if they only offer a voucher, you can specifically request cash and are entitled to it.

2. Tarmac delay you for more than 3 hours on domestic flights (4 hours international) without offering deplaning

The tarmac delay rule is a hard limit with real enforcement. Airlines must provide food and water after 2 hours, must maintain functioning lavatories, and must offer the opportunity to deplane after the 3-hour limit. Violations result in significant DOT fines. This rule was established after the 2009 Colgan Air tarmac incident.

3. Fail to provide involuntary bump compensation that meets DOT minimums

If you’re involuntarily bumped from a domestic flight and the delay is 1–2 hours beyond your original arrival, the minimum compensation is 200% of your one-way fare (max $775). For 2+ hour delays, it’s 400% of your one-way fare (max $1,550). These are minimums — airlines can and do pay more voluntarily to avoid the bumping process entirely. Knowing these numbers means you won’t accept a $150 voucher for a 5-hour delay when you’re owed $775 in cash.

The travelers who fare best when things go wrong aren’t the ones who argue the most — they’re the ones who know which three categories give them real legal leverage and focus entirely on those situations. Everything else is a negotiation with a company that holds most of the cards.