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Old Nov 4, 2006 | 2:54 pm
  #4  
sbm12
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On CO, if you are not elite, you can only upgrade from Y, H, K, N, or B fares. These are the expensive ones. If you are elite you can upgrade on any fare.

On DL I believe the eligable fares for upgrading are Y, B and M, also their expensive ones.

On NW you can only upgrade on Y & B fares for TATL/TPAC flights; there are fewer restrictions for domestic US, but there are still some.

I have no idea how the other SkyTeam carriers play the game.

S.
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