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Old Mar 15, 01, 9:39 am
After Burner
Join Date: Sep 2000
Location: OGG, YYC
Programs: AA, AC
Posts: 3,622
The first sentence printed on the front of the Prestige NA Upgrade Certificate appears under the heading Validity. It states:

For one-way upgrade from origin to destination (including connections) to Executive Class from Y or M booking class ...

Could this possibly be any clearer??
After Burner is offline