As of August 1st Fedex has 33 MD
-10s in service. 4 more are slated to be converted by December, plus another 6 by mid 2005.
As far as the 747s, Fedex inherited a pretty mixed fleet of 747s from Flying Tigers. Fleet included -100s and -200s with a mix of 3 different engine types, JT9D-7A, 7Q
and the 70A. The -100s were quickly shed and a small fleet of 6-8 -200Fs were operated until 96 or 97.
I believe the 747s were primarily let go as they were not economic in such a small fleet count, and also the 747 was not a good fit for the Fedex network. As the MD
-11 fleet grew in size it quickly became the aircraft of choice for international flying plus the heavier domestic routes.
I also know the Fedex B747 fleet suffered from poor reliability compared to other fleet types at the company.