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Thread: Need help understanding Codeshare & no upgrades
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Old May 3, 2011 | 3:39 pm
  #2  
sbm12
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CO can upgrade any flight on their metal regardless of the code it was sold under but you'd have to pay CO miles/certs for the CO segments and UA miles/certs for the UA segments. You cannot get the CO segments upgraded using the same miles/certs for both right now.
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