The Lockheed Altair was a development of the Lockheed Sirius. The Altair was one of the first aircraft designs with a fully rectractable undercarriage.
The first five Altairs were converted Siriuses. Another six Altairs were built from scratch: three by Lockheed, two by Detroit Aircraft Corporation, and one by AiRover. The AiRover Altair, dubbed The Flying Testbed, was powered by a Unitwin engine, which used two engines to drive a single shaft. The Unitwin was used in the Vega Starliner, which never went into production.
- Francillon, René J, Lockheed Aircraft since 1913. Naval Institute Press: Annapolis, 1987.
- John Oder - Aero Museum Services is dedicated to bringing these Vintage Aircraft back into service. http://aeromuseumservices.com/
- Ron Cuskelly - Very detailed information of Lockheed Altair "Lady Southern Cross". Contains images, data etc - http://www.adastron.com/lockheed/altair/altair.htm