Fairchild factory-built 22 Merlin IV-C airplanes (the marginally-successful "corporate" version of the Metro III) as straight freighters and called them "Expediters."

Twelve "light" airplanes (14,000 lb MTOW) originally went to UPS (with N-numbers ending in UP) and were originally operated under contract by SAT.

Ten "heavies" (16,000 lb MTOW, can be identified by serial numbers ending in "A") went to DHL (with N-numbers ending in DH) and were originally operated by DHL's own crews.

Ameriflight has 17 of the 22 Expediters built. There are very minor systems and performance differences between the Merlin IV-C and Metro III.

Now, take an anti-TMI pill.