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C-21A Learjet
Utility & Liaison Aircraft · 
Air · operated by 1 country on the map · 19 units on record
The C-21A is the U.S. Air Force designation for the Learjet 35/36, a twin-engine business jet built by Learjet (later Bombardier) from 1973. Used as a light transport and staff/liaison aircraft, about 19 remained in USAF service as of 2019, plus a couple with the Navy under related designations.
Photo from open sources, shown for identification of the type
Operators
| Country | Branch | Quantity | |
|---|---|---|---|
 United States | US Air Force | 19 | on the map → |