CAT-
Sounds like hard work, but fun as all get out! I help out at the EAA in Oshkosh. When not working, you can find me listening to the war birds start, taxi, take-off....what noise!! Personal favorite P-51 fly-bys.
I don't remember Fed-Ex Beeches. I do recall their Falcon 20s. My old boss was asked to join them as a pilot & examiner very early on (he was one of the first to fly the 20). He thought the company wouldn't last fly boxes in jets and turned them down. I think he still kicks himself about that call.
In the CAT, how much flying time and how many fuel stops. Do you have any old Pan American ghosts flying that route with you?