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Thread: AS Award domestic "upgrade" clearance policy for international business/first
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Old Sep 25, 2013 | 6:40 pm
  #11  
jackal
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Originally Posted by baliktad
A is always a subset of U, which in turn is always a subset of F.

If there are 3 F seats for sale, there can be 0, 1, 2, or 3 U seats available.
If there are 2 U seats available, there can be 0, 1, or 2 A seats available.
Ah, I had it backwards.
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