Just out of curiousity, I flew a flight on China Eastern airlines (Skyteam member) last month, didn’t put my sky miles # into the system when buying my ticket, and just now have gone about requesting mileage credit. I provided all flight details, and even a copy of an electronic receipt with my e-ticket #, however Delta insists I need a copy of my physical boarding pass to give them. Which would be my left over ticket stub…that I can’t seem to locate. Is this normal?? It seems like overkill.