Dassault Falcon 20 (N277RA)

Old Federal Express Falcon 20s?

I believe so.

I believe the eight ball on the tail represents serial number eight if my memory stands corrected.

ICMI,

I think you meant to write, "If (your) memory serves (you) correctly."

Boy,that would be an early serial number! A tribute to the airframe. How many cycles?? Note the number of latch points around the edge of the cargo door. By my back of the envelope calcs, there would be around 40,000pounds of cabin pressure differential trying to push that massive door open when the Falcon is at her cruise Flight Level.