With respect to the aircraft operated by ABX
Air for DHL:
"At March 31, 2006, the Company’s operating fleet consisted of 112 aircraft, including 29 Boeing 767, 70 McDonnell Douglas DC-9 and 13 McDonnell Douglas DC-8 aircraft." http://www.abxair.com/ir/10q2006q1.PDF
Some of those 767s, and some of the 767s coming aboard (7 more, I believe), will be used for charter service to carriers other than DHL. The DC8s are with the original engines (-60s). There is a rumour on the stock message board that some of the DC8s will be retired pretty soon, which may or may not make sense since it appears from the latest 10Q that they just spent $6 million or so to heavy-check 6 of those aircraft.
AStar, the other carrier, doesn't file 10Qs because it's not a publicly-traded company. It's web site may therefore be out of date, but it says that they fly 42 aircraft: 26 727s, 9 DC8s (the ones with the CFM re-engining: -70s), and 7 A300-B4
Hope this helps.