It seems DL didn't keep their part of the agreement.
I recently flew ATL- ORD with a DLXXX ticket, and even though there were plenty of seats left in FC, when I asked for the upgrade at the gate I didn't get it. Also I tried calling AM beforehand to get the upgrade, and they said they used to be able to do it, but since DL would delete the upgrades shortly before departure they don't anymore. They recommended that I ask for it at the gate.
Originally Posted by UnofficialDLHelper
The upgrade policy on codeshare flights is the result of a bilateral agreement between the frequent flyer programs of both companies: Aeromexico and Delta, as follows:
• Aeromexico and Delta agree to allow each other's tier elite frequent flyer members to be upgraded along with a companion on codeshare flights within North America, according to the rules of the marketing carrier. The upgrades apply on transborder flights and beyond.
• The upgrades are subject to availability in the premium class. The upgrades can be booked and confirmed in advance to the flight's departure, or be directly requested at check-in counters.
Both companies agree in respecting the upgrades that were confirmed in advance to the flight's departure, as well as make any possible effort to give the upgrade to those members requesting the upgrade directly at check-in counters.
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