Some companies in the US with Professional Flight Engineers (PFEs) have been Amercan Trans Air (1011 and 727), Airborne Express (DC-8), Atlas (747), the former Zantop (Electra and DC-8), and maybe one or two others, probably the cargo 'shellgame' under the Connie Kallitta umbrella. Many or most of the PFEs seem to come from the US military squadrons such as the P-3, (K)C-130, E-6, KC-10, C-141/C-5 and various 'Air Force One' Boeing fleets at Andrews AFB.