777XF would be awesome but it’s not going to fit into a lot of gates. The 330 and 350 both have that problem too with longer modern wings. I think that’s going to be the real issue.
Having flown the
319/320/321 CEO I definitely agree with previous comments that the performance of the 321 is terrible. I think the whole family has the same wing, so the 321 wing is loaded up making it sluggish in a climb and barely allows speed brakes while clean below 250 KIAS.
My guess is that FedEx is probably waiting to see what happens with the 797/NMA project to assess whether they’ll talk about the eventual 757 replacement with Boeing or Airbus.
Airbus has patented folding wings, so if they offered an A330NEO freighter or A350F with folding wings, then it would solve a the gate space issue.