Originally Posted by dw

Based on my reading of these entry requirements, the answer is no, even if you were connecting to a Deep South America flight in J in MEX. If you were flying a DL domestic flight to another US city where you would connect to a SkyTeam operated deep South America flight in J, then it would have been yes.

• A nonstop transoceanic ticket in First/Business Class on a SkyTeam ®-operated flight;
• A domestic ticket in any class connecting to same-day First/Business Class ticket on an transoceanic SkyTeam-operated flight;