Which airlines overbook?

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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Moreover, every airline in the United States overbooks its flights at least some of the time. All but one, that is. JetBlue Airways (JBLU -1.22%) is the one holdout that chooses not to overbook its flights -- to be more customer-friendly.

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Passengers can inquire about overbooking by contacting their respective airlines or using apps that show available seats per cabin. If your flight is overbooked, airlines will usually ask for volunteers to give up their seats and offer compensation in return.

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Overselling flights is a commonly accepted practice in the airline industry. While airlines have good data and get things right most of the time, this does sometimes lead to overbooking situations, where some people need to be removed from flights.

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In recent years, Delta has not been afraid to oversell its flights. It bumps more than twice as many people per enplanement than American or United.

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One is to check in early. Once you check in, you'll probably get a seat assignment, and the chances of getting bumped decrease. Don't wait to board! If you're not in your seat, the airline may assume you won't show up and give your seat to another passenger.

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Some of the factors that airlines consider when deciding who gets bumped include check-in time, fare paid by the passenger, and frequent flyer status. It is important to note that these criteria must not be used in a way that prejudices or disadvantages any passenger unjustly or unreasonably.

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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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Airlines can sell more seats than they have available – as they assume that not all passengers will show up for the flight. If all passengers do show up, some may be denied boarding or “bumped” off the flight.

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But if no volunteers come forward airlines can involuntarily bump passengers - though Delta says it rarely comes to this. Airlines use an algorithm to determine which journeys to oversell and by how much.

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Arrive early: sometimes passengers will be offered a bump before reaching the gate, or will be approached first if they arrive at the gate early, when it becomes apparent a flight is oversold. By being one of the first passengers available, you enhance your chances of scoring a potentially lucrative bump offer.

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Travel experts warn that around 150 tickets are sold for every 100 seats available, so you've undoubtedly been on an overbooked flight. British Airways admits to overselling 500,000 seats in a single year, leading to 24,000 passengers having to be bumped from flights.

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Does Southwest overbook flights? No. However, there can be operational instances where we will be over available seating capacity, resulting in an oversale. Overselling a flight can occur because of weight restrictions and aircraft type changes.

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If there are not enough passengers who are willing to give up their seats voluntarily, an airline may deny you a seat on an aircraft based on criteria that it establishes, such as the passenger's check-in time, the fare paid by the passenger, or the passenger's frequent flyer status.

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-Delta and Allegiant still are the least likely mainline and budget airlines to bump a passenger. During Q2 2020, both Delta and Allegiant bumped zero passengers. -American Airlines Group's trio of airlines improved their bumps per 100,000 passengers drastically in Q2 2020 versus Q3 2019 – Q2 2020.

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Passengers who are denied boarding involuntarily due to oversales are entitled to compensation that is based on the price of their ticket, the length of time that they are delayed in getting to their destination because of being denied boarding, and whether their flight is a domestic flight or an international flight ...

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Upgrade Your Air Travel: 10 Tips to Score a First-Class Seat
  1. Join airline loyalty programs.
  2. Volunteer to be bumped.
  3. Use offers from your credit cards.
  4. Book flights during off-peak times.
  5. Check for available upgrades online.
  6. Consider late flight offers.
  7. Arrive early for check-in.
  8. Bid for an upgrade.


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Delta has an innovative policy of asking passengers to bid to get bumped. Essentially, the airline asks willing passengers to state the lowest-value flight voucher they'd accept to get bumped. As a result, Delta saves money, and it's up to passengers to accurately estimate the value of their lost time.

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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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Airlines overbook flights to maximize revenue and ensure flights are full, as routine no-shows and flexible ticket holders contribute to empty seats. Volunteers are asked to switch flights when there are more passengers than available seats, as it is more cost-effective than flying with empty seats.

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Notice of Overbooking of Flights
If there are not enough volunteers, the airline will deny boarding to other persons in accordance with its particular boarding priority. With few exceptions, persons denied boarding involuntarily are entitled to compensation.

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