What is cost per seat mile?

Cost per available seat mile (CASM) is a common unit of measurement used to compare the efficiency of various airlines. It is obtained by dividing the operating costs of an airline by available seat miles (ASM). Generally, the lower the CASM, the more profitable and efficient the airline.



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While you might feel you're entitled to receiving the airline miles accrued when you pay for someone else's ticket, only the passenger can earn miles from flying. Frequent flyer programs will not award miles when the passenger's name doesn't match the name on the loyalty account provided at check-in.

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Average domestic airfare price by day
  • Tuesdays and Wednesdays are the cheapest days to fly domestically.
  • Saturday and Monday flights can help you avoid the Sunday rush.
  • Wednesdays and Thursdays are the cheapest day to fly internationally.
  • Book one to three months in advance.
  • Set a price alert.


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As you can see, the lowest-performing airlines were JetBlue, Spirit, Frontier, American, and United. While Hawaiian Airlines took the top prize, followed by Delta, Alaska Airlines, and Southwest. So, why the low marks for certain airlines? A simple breakdown of the data is necessary to understand.

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(aviation) Time from the moment the aircraft door closes at departure of a revenue flight until the moment the aircraft door opens at the arrival gate following its landing. Block hours are the industry standard measure of aircraft utilization.

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Membership numbers are nontransferable. Only one person may be enrolled per SkyMiles account.

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Can I combine my Accounts with anyone else? You may transfer Miles and even merge your profile with another Collector Account in order to pool your collecting efforts and the Miles existing currently in your AIR MILES Cash and Dream Accounts.

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How do you avoid a seat selection fee? If you're traveling with a group, the best way to avoid a seat selection fee is to book your seats at the same time. If the airline is assigning seats for you, it typically seats people under the same record locator number together.

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Just say no. Within 24 hours of your departure, the airline will assign you a seat. Pro tip: If you want to avoid paying for a seat assignment, arrive at the airport early. That way, you'll have the pick of the unassigned seats.

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