Originally Posted by
dollerman73
Thanks Evan +1. But why not documentation on this from either companies, just some random website proclaiming it the tie breaker???
Not sure what random web site you are referring to. FlyerTalk?
Found it documented (not Amex or DL)
here.
FlyerTalk thread
American Express-DELTA Reserve - UPGRADE INFORMATION
Perhaps Amex told DL "until you can show us how you place card holders ahead of others on the UG pecking order we (Amex) are not going to tout that benefit" or "unless you can guarantee that you won't take this benefit away, we aren't going to market the Reserve card priority for upgrades".