The Learjet 60 is actually an evolutionary version of the Model 55 that was introduced in 1981. The 55 was the first Learjet with enough cabin room to stand up, and first to have a real lavatory.

When I first heard that Learjet would build its new Model 85 entirely from composite materials, ... So far there has not been an FAR Part 25 transport airplane built even mostly from composites.

The FAA STC approval, STC Number ST02036WI allows the installation of the Garmin G700TXi System in the Learjet Model 35/35A(C-21A)/36/36A airplanes with the FC-530/FC-535 autopilot.