SESKStuff Everyone Should Know
SESK: Stuff Everyone Should Know · sesk.info/aero-airmail-space-incentive

Why did the McNary-Watres Act encourage airlines to use larger airplanes?

Payment depended on available cargo space.

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  1. Mail pay depended on route length
  2. Mail pay depended on aircraft speed
  3. Mail pay rewarded available cargo space ✔

Why: Airmail carriers earned money according to how much cargo room they offered. More space could therefore mean more revenue, making larger aircraft attractive.

Huh, didn't know that: The Air Mail Act of 1925 let the Post Office contract with airmail carriers.

The dad joke
Why did the mailbag choose the big airplane? It needed more room to address its problems.
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References

Answer: Mail pay rewarded available cargo space. Airmail carriers earned money according to how much cargo room they offered. More space could therefore mean more revenue, making larger aircraft attractive.

  1. Journey of Flight Teacher's Guide, chapter 3 www.gocivilairpatrol.com/media/cms/2nd_edition_Teachers_Guide_5D3166D76F9B1.pdf
    airmail carriers were paid according to the available cargo space
    Checked 2026-10-10.

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