Editing Lockheed Model 18 Lodestar (section)

===US Army Lodestars===
;C-56
:Powered by 1,200 hp [[Wright R-1820|Wright 1820-89]] engines, one Model 18-50 for evaluation.<ref name="Serials77">Andrade 1979, pp. 77–78.</ref>
;C-56A
:One impressed Model 18-07 with two [[Pratt & Whitney R-1690|Pratt & Whitney R-1690-54]] engines.<ref name="Serials77" />
;C-56B
:Thirteen impressed Model 18-40s with two [[Wright R-1820|Wright 1820-97]] engines.<ref name="Serials77" />
;C-56C
:Twelve impressed Model 18-07.<ref name="Serials77" />
;C-56D
:Seven impressed Model 18-08.<ref name="Serials77" />
;C-56E
:Two Model 18-40s impressed in 1943.<ref name="Serials77" />
;C-57
:As Model 18-14 powered by two 1,200 hp [[Pratt & Whitney R-1830|Pratt & Whitney R-1830-53]] engines.<ref name="Serials77" />
;C-57A
:Allocated for impressed aircraft, not used.<ref name="Serials77" />
;C-57B
:Based on Model 18-08 fitted for trooping; seven aircraft built.<ref name="Serials77" />
;C-57C
:Repowered C-60A with Pratt & Whitney R-1830-51 engines; three aircraft converted.<ref name="Serials77" />
;C-57D
:Repowered C-57C with Pratt & Whitney R-1830-92 engines; one aircraft converted.<ref name="Serials77" />
;C-59
:Based on Model 18-07 powered by [[Pratt & Whitney R-1690|Pratt & Whitney R-1690-25]] Hornet engines; 10 aircraft built, transferred to Royal Air Force as '''Lodestar IA'''.
;C-60
:Model 18-56 powered by Wright R-1820-87 engines; 36 aircraft built, some transferred to RAF as '''Lodestar II'''.
;C-60A
:As the C-60 but fitted out as a paratroop transport powered by Pratt & Whitney R-1830 Twin Wasp engines; 325 aircraft built.<ref name="Serials77" />
;XC-60B
:One C-60A fitted with experimental de-icing equipment.<ref name="Serials77" />
;C-60C
:Proposed 21-seat troop transport aircraft, never built.
;C-66
:Powered by Wright R-1820-87 engines; one aircraft built, 11-passenger interior for transfer to the [[Brazilian Air Force]].<ref name="Serials77" />
;C-104
:Original designation for C-60C