Originally Posted by platbrownguy
I think you have it switched.
DL elites can upgrade with a DL flight NUMBER on AM metal, AM elites can upgrade with an AM flight number on DL metal.
If your flight had been a continuous flight that you booked through AeroMexico (i.e. MEX-ATL-ORD), you should have had no problem, but since you said it was a DLXXX ticket, you were not eligible.
Correct. As I posted above in this now dusty thread, the key to upgrading on flights to/from Mexico is to book the ticket with the airline you have status on.
DL Medallions....make sure your ticket is on DL coded flights. And AM elites, make sure you’re on AM coded flights. Otherwise it’s going to be a crapshoot on the upgrades.