5. Vanguard Express Shorts 360

In 1983, Vanguard Airlines signed an agreement for 40 Shorts 360 airplanes to be operated by Southern Commuter Airlines, a Knoxville based firm that would, at their own insistence, assume the name "Vanguard Express" when operating flights on behalf of Vanguard. These aircraft saw service at every Vanguard hub airport (Including GUM), a distinction held by no other aircraft in the Express fleet. The Shorts 360 was eventually phased out in favor of additional Embraer 120s and the arrival of the Embraer 145 in 1997.

Though smaller aircraft had been operated on behalf of the airline before, the Shorts 360 (and Southern Commuter Airlines) was the first to use the Vanguard Express name, as shown above. This would later lead to the founding of the "Vanguard Express" operating brand name (and later wholly owned entity) used by a number of independently owned regional airlines providing commuter airliner and regional jet feeder service under agreement with Vanguard.

Southern Commuter Airlines would later expand into all of Vanguard's hubs, opening maintenance facilities in Houston and Detroit. Today it operates a large fleet of Embraer 145XRs and is wholly owned by Vanguard Airlines.

A single Shorts 360, N274VX, resides at the Vanguard Airlines flight museum in Memphis, Tennessee.

(Shout out to Blonde_Bird, this template is amazing.)