I'm in MCE for a DFW-HKG hop in about six weeks. I called recently, to inquire about upgrading into PE.
The AAgent looked, said it could be done at a reasonable price, but the only seats she could see available were middle seats. With my history of DVT/PE, I only take aisle seats. I thanked her, declined to change, and am waiting to see if the J upgrade comes through. (Historically, the J upgrade usually pops out some time between when I leave the Admirals Club and I get to the gate. For this one, I won't have time to hit the AC, and, if it happens, it will pop out sometime after we go wheels-up out of HSV.