Airlines sell seats they don't physically have. That's overbooking. When the gamble fails, someone stays behind, and the money question is which rulebook applies to that ticket.

Did they bump you, or did you raise your hand?

If you took a voucher, you probably sold the legal payout. Involuntary denied boarding is the path that pays under U.S., EU, UK, and Canadian rules. The figures don't stack. You claim under the regime that actually covers the flight.

What overbooking is

Oversale means more ticketed passengers showed up than seats. It's a revenue choice, not weather and not a broken engine. Compensation is the tradeoff in the markets below. You still need a confirmed booking. You still need to be on time at check-in and the gate.

Volunteer offer or involuntary bump

U.S. carriers must ask for volunteers before they deny boarding against a passenger's will on an oversold flight. EU and UK rules expect that sequence too. A volunteer deal is whatever you accept: cash, a voucher, a hotel, a later seat.

Thing is, a large voucher can beat a 250 euro short-haul figure if it also gets you out that night. Get the volunteer terms in writing. Verbal credits fade.

U.S. flights and DOT oversale compensation

DOT bumping and oversales rules live in 14 CFR Part 250. They cover most scheduled U.S. domestic flights and many flights to or from the United States, and they don't copy the EU euro table. The delay to your destination sets the rate.

If the airline gets you there within one hour of the original arrival, it owes no denied-boarding compensation. On a domestic ticket, a delay of one to two hours pays 200% of the one-way fare. A delay over two hours pays 400%. International itineraries keep the 200% band until you are more than four hours late, then 400% applies.

DOT sets dollar caps on those percentages and revises the caps for inflation. Ignore a screenshot of an old maximum. Use the written notice the airline must give you, or the same DOT bumping page.

Cash or a check is the default. You can take a voucher instead, but only if you agree. They should pay you at the airport. If your rebooked flight leaves first, they have 24 hours.

You also keep the unused ticket value if you walk away, or you get rerouted if you still want to travel. The bump payment sits on top of that seat or refund. It is not a substitute for getting you there.

Some flights fall out of the cash formula: very small aircraft, certain charters, and denials tied to safety, security, health, or your failure to check in or bring valid documents. Those are not oversale payments.

EU261 denied boarding amounts

EU air passenger rights use distance, not your fare. Distance sets the figure: 250 euros up to 1,500 km, 400 euros up to 3,500 km, and 600 euros beyond that. Each passenger with a booking can qualify, including a child on their own ticket.

Turns out the airline can halve those sums if it reroutes you and you arrive only a little late. The windows are two, three, or four hours by distance band. Meals, an overnight hotel, and two calls or emails are extra care, not a stand-in for the compensation.

The map matters more than the logo on a low-cost boarding pass. EU261 applies to any airline departing an EU airport. It also applies to an EU carrier arriving in the EU. A U.S. airline leaving Dallas for Frankfurt is not an EU261 departure. The same airline leaving Madrid for Dallas is.

Accept a volunteer package and you step outside the 250 to 600 euro grid. Read the gate form before you sign it.

UK denied boarding rules

The UK kept a denied-boarding scheme that tracks the same distance bands after Brexit, and it mainly covers flights leaving the UK plus certain arrivals on UK carriers. Complain to the airline first, then the UK Civil Aviation Authority if the carrier ignores you.

Canada APPR bumping compensation

Canada doesn't pay by kilometer. Canadian Transportation Agency bumping guidance ties the amount to delay at your final destination and to the size of the airline.

Large carriers pay CAD 900, CAD 1,800, or CAD 2,400 as the delay crosses six and nine hours. Smaller airlines pay less. The airline must explain the amount and your complaint options at the airport. You'll want that explanation in writing.

A refusal to carry you because of documents, safety, or conduct is not an oversale bump. That dispute runs through the airline's tariff, not the APPR bumping scale. File with the airline, then the Canadian Transportation Agency.

How to claim

Keep the paper, press the airline, then go to the regulator if you have to.

1. Save the boarding pass, booking, denial notice, and any rights form they handed you.
2. Photograph screens and keep the time-stamped emails or texts.
3. At the gate, either accept volunteer terms in writing or stay involuntary and ask for the cash formula.
4. Get the new routing or refund in writing the same day.
5. Email the airline once you are home and name the rule that fits: DOT Part 250, EU261, UK passenger rights, or the APPR.
6. If they refuse or stall, use DOT aviation consumer FAQs for U.S. coverage, a national enforcement body for an EU261 flight, or the Canadian Transportation Agency for an APPR flight.

to be honest, the claim that dies most often is the one with no denial notice and a fuzzy memory of a verbal voucher, so don't leave the airport with only a photo of the departure board and a hope that customer-service chat will reconstruct the night for you.

When the airline can deny the payout

You were late to check-in or your documents were wrong. A safety, security, or health refusal that is about you is also outside oversale pay. You already signed a volunteer form. Under DOT, your replacement flight landed within one hour of schedule.

Overselling the cabin is not an extraordinary circumstance that wipes EU denied-boarding pay. Weather that cancels the flight is a different claim. Don't mix the two files.

If both DOT and EU261 could be argued on a connecting itinerary, pick the better single path. Don't expect two full payouts for one missing seat.

Before you leave the gate, get a written denial or a written volunteer agreement and compare it with the formula that actually applies to that flight. File with the airline while the boarding pass is still on your phone.