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Old Nov 9, 2016 | 3:08 pm
  #4  
3Cforme
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Join Date: Jun 2001
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It's common for all U.S. carriers (maybe except JetBlue) to sell more tickets than there are seats on the plane. Actual rates of IDB are pretty low - although Endeavor/American Eagle is not stellar.

You are correct that IDB goes by time of check in for AA.
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