FedEx was going to buy some and even built a hangar in Memphis for it. It didn’t work out and now Fred’s big jet is the 777. They cram one of those, an MD10 and an A300 or 767 in that hangar nowadays.
The 787 Dreamliner can fly all the way from China to Memphis, non-stop. Large capacity, better fuel economy. I used to be able to quote a bunch of statistics, but in general, FedEx decided the overall range, cost, capacity, and operations were much better than Airbus. 747’s are old and being phased out. Actually more difficult to load.