Why are airlines allowed to sell more tickets than seats?

Empty seats are not profitable, so overbooking allows the airline to ensure that every seat on the airplane is making money for them. The “no-show rate,” which helps airlines determine how many extra tickets to sell, is determined by data from past flights connecting the same points.



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As a result, airlines can, with a degree of certainty, overbook a flight considering the number of no-shows expected, thereby maximizing the capacity available to customers. For consumers, this practice is beneficial because it allows more consumers to fly at the time, date and fare of their choosing.

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Whether you're flying from New York or New Orleans, Lisbon or London, airlines continue overbooking to compensate for “no-shows” all the time. Simply put, they sell more tickets than they have available seats. And it's not an illegal practice.

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US regulations are quite strict: passengers are only eligible for compensation if they are denied boarding due to the airline overbooking the flight in question. In these situations, airlines must ask for volunteers to surrender their seats before they can start bumping passengers against their wishes.

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Overbooked flight compensation under US regulations
If the airline does not make any substitute travel arrangements for you, you are entitled to 400% of the one-way fare price, not to exceed $1,350 as well as any optional fees paid as part of your reservation (e.g. bag fees, seat upgrades, etc.).

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Airlines do have the legal right to overbook seats for flights, and unfortunately, overbooking is becoming an increasingly common occurrence. Airlines overbook to maximize profit to compensate for last-minute cancellations.

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Sometimes, when an airline asks for volunteers to give up their seats and fly on a different flight, there are not enough volunteers. When this occurs, the airline will select passengers to give up their seats. This is called “involuntary denied boarding” or “bumping.”

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When you are involuntarily bumped from a flight, you can get cash (a check or credit on your credit card) from airlines. Overbooking is not illegal, and most airlines overbook their scheduled flights to a certain extent to compensate for “no-shows.” Passengers are sometimes left behind or “bumped” from a flight.

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Involuntarily Giving Up Your Seat (Bumping) Sometimes, when an airline asks for volunteers to give up their seats and fly on a different flight, there are not enough volunteers. When this occurs, the airline will select passengers to give up their seats. This is called “involuntary denied boarding” or “bumping.”

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Frontier Airlines bumped the biggest proportion of passengers of the 15 largest US carriers in early 2023. Of every 10,000 Frontier passengers, 3.73 were involuntarily denied boarding due to oversales, the DOT said. Allegiant, Delta, Endeavor, and Hawaiian didn't bump any passengers in the quarter, per the DOT.

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There is one most important thing to remember when passengers must receive compensation for an airline overbooking a flight. And that is there is no limit to the amount of money or number of vouchers an airline may offer. And passengers are free to negotiate with the airline.

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The main reasons is to maximize profit skimming. By overbooking flights, airlines compensate for so-called no-shows or last-minute cancellations. This is a complex analysis system based on historical flight data of passengers on the respective routes.

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Let's break down what this actually means: On most airline basic economy tickets, you won't be able to select your seat ahead of time. Instead, you'll be assigned one at check-in or the gate. So you're not any more likely than any other passenger to get bumped from the flight.

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If you purchase Main Cabin or Delta Comfort+ and then apply your Global Upgrade Certificate, you will be upgraded to Delta Premium Select upon request and then will be added to the waitlist for Delta One and eligible to clear starting 24 hours prior to departure.

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A: If you get bumped from first class to economy — that's called an involuntary downgrade — you should get a prompt and full refund of the fare difference.

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Here's a look at American carriers, starting with the worst for overbooking and descending to the best:
  • Spirit Airlines — 78 IDBs per million passengers.
  • Frontier Airlines — 55.
  • Southwest Airlines — 41.
  • Alaska Airlines — 28.
  • American Airlines — 24.
  • United Airlines — 13.
  • Delta Air Lines — 3.
  • JetBlue Airways — 2.


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Once you are at the gate, which you might want to reach an hour before the departure time, inform the agents at hand that you are willing to accept a bump if required. However, in exchange, ensure you have a confirmed (not standby) flight as the minimum return for your cooperation.

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However, there is no fixed way to find out if your flight is overbooked. Since overbooking usually happens during peak season, passengers can contact the customer service representatives of their respective airlines and inquire about overbooking.

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Airline tickets even allow some room for negotiation if you're not satisfied with the results when you search for cheap tickets. If you spend a lot on airline tickets every year, and are part of an airline's frequent flier program, you have more leverage than someone who rarely travels.

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