I'm flying DFW to FRA on May 1.on a 788. The seat map changed just this morning (or overnight) to a refitted 788 and now includes Premium Economy. I had an MCE seat in row 11 but just switched my seat to a PY seat in row 8 as they are all labeled as MCE on the seat map. Good idea? Any chance they will take the seat away from me at the last minute because it actually is PY?