Lockheed 12 Electra Junior - track version[/heading]
Model 12A - basic light transport variant for six passengers, engines Wasp Junior SB, 70 pcs
Model 12B - variant of the engines, Wright Whirlwind, 2 pcs
Model 12-25 - a variant with engines Wasp Junior SB3, 2 pcs
Model 12-26 - transporter variant for the air force of the Netherlands, India, 20 pcs
Model 212 - armed trainer variant for the air force of the Netherlands, India, 16 pcs
C-40 - 3 12A built for the USAAC
C-40A - 10 machines for the USAAC with the interior for three passengers and 500 kg of cargo
C-40B - the experimental machine for the USAAC with a fixed nose landing gear
UC-40D - 11 seized 12A for the USAAC, 5 later handed over to the RAF
JO-1 - the five-digit 12A ordered by the navy to the naval attache in Brazil
JO-2 - 5 six 12A of the ordered as the staff aircraft for the navy and marine corps
XJO-3 - the experimental machine for the navy with a fixed nose landing gear and attachment hook
R3O-2 - confiscated civilian 12A used by the naval attaché in London
Francillon, Rene J. Lockheed Aircraft since 1913. Naval Institute Press, Annapolis, 1987. ISBN 0-85177-835-6.
Marson, Peter J. The Lockheed Twins. Air-Britain, Tonbridge 2001. ISBN 0-85130-284-X.
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Marson, Peter J. The Lockheed Twins. Air-Britain, Tonbridge 2001. ISBN 0-85130-284-X.