Since my last post in this thread I switched from Android to the iPhone 6 and have been using Apple Pay at various places. A while ago I scanned my iPhone, got the full Device Account Numbers for my Rewards Network cards and added them to MileagePlus Dining. I totally forgot I had done this until today when I got an email from them asking to rate a place where I used Apple Pay.

So yeah, if you're willing to jump through some hoops Apple Pay will indeed work with the airline dining programs. When I get home I can post some instructions on getting the full DANs for those interested. ^