Originally Posted by
irishguy28
Of course, if you can somehow book the DL flights under KL codeshares, it should probably work as if it was a "normal" KL flight.
You are going to have to ring anyway - if the MMB on KLM.com doesn't let you upgrade - so if you are seeing availability
now, then the correct procedure should be to ring
now, rather than waiting and risk losing the upgrade space.
KL6012 is an ATL-AMS flight...