Originally Posted by
npretnar
Your luck on this might be specific to the generosity of the MUC out-station GAs, plus the fact that you're a frequent flyer on this route.
Have you tried this on any other routes originating in any other stations?
MUC-CLT is a 6-7 times a year thing for me - I have nothing comparable from other airports. However I did do MAD-MIA and LHR-MIA (each once) last year where each I got a free y->PE upgrade