Most Airline branded guitars from the early 1960's were made by Valco - also makers of Supro and National guitars. They also made all the res-o-glas models from that era under all three brand names. However, some of the "value" priced models were made elsewhere. Here is another model from the Harmony USA factory - the Airline Jupiter. It was less popular than its cousins - the Silvertone Jupiter and the Harmony Stratotone Jupiter pictured here:
All had two volume, two tone controls and a 3 way flipper switch. All had DeArmond pickups - the Harmony and Silvertone models had the gold foil version, where the Airline models had the Argyle ones. All are full hollowbody, All have an unusually short 24" scale, floating wooden bridge and trapeze tail. They are extremely lightweight. They have become quite sought after in today's vintage guitar market.
The Harmony and the Silvertone added a "blend" pot, that allowed the user to blend between the two pickups when the pickup flipper switch is in the center position. Cool!
In 2012 Eastwood Guitars issued a modern version of the Airline Jupiter, featuring a longer scale and a fixed wooden bridge. In June of 2013, Airline introduced the Airline Jupiter PRO, creating a professional grade version of the popular vintage Jupiter model by adding a set neck, adjustable tun-o-matic bridge, the control layout of the Stratotone Jupiter and that very cool "blend" control. They also released a Dallas Green Signature model with a custom Honeyburst color with neck and headstock binding.