I flew EI-PAK about eight years ago when it was operating for TNT. Call sign then was an appropriate "Nitro". Not quite the same as "Quality" of today. It was the first a/c I flew to have T-CAS. I can remember playing with it to overtake other slower flying airplanes. Airplanes like, pretty much every civilian thing out there. A little bit more than .86 and the thing would tuck her nose down and just clip along.
Memories, alas. Now I am lucky to see .80. On a good day.