I missed that detail, but with delta.dumb one never knows.

With any luck, someone here can quickly tell you whether there were any gate upgrades of elites on your flight. I assume that you have posted the flight number, cities, and date accurately.

Could you have had a Y-UP fare rather than a regular Y? That could have had booking class D for an international segment I guess, although I would have expected S or I. If it did not break the fare at your connection, could you have had an or P class on the domestic connecting flight? Can you find your exact fare codes and still see the fare rules?

Was this the flight that was diverted for a fuel stop and then went mechanical, resulting in a very late arrival into ATL?