Originally Posted by
Often1
Sounds as though OP neither tried to assert the use of the lane or to speak with someone from DL on the spot (99% of problems are best dealt with on the spot).
At best, OP will be reminded that DL does not guarantee all services at all airports as per DL's website and at worst, he'll hear back something even more bland.
As I mentioned, I did have a discussion with an Air France employee about whether I as a Delta Elite had to wait in the general line. I did not think that having a legalistic argument with someone who spoke English as a second language and who had no power to change the local rules that were in place would have been productive. As far as talking to someone from DL on the spot - this was an AF operated flight, all of the personnel that I saw were AF, not DL (just as when I left the US all of the people I dealt with were AF, not DL.)