Model Variants (Including Prototypes)
367-80 - Demonstrator Model Designation
KC-135A - Initial USAF Production Model Designation fitted with J57 turbojets.
KC-135E - Re-engined Air National Guard and Air Force Reserve units fitted with TF33 turbofans.
KC-135FR - Re-engined C-135F Models for French export.
KC-135Q - Modified KC-135 systems to refuel the Lockheed SR-71 Blackbird (56 converted as such).
KC-135T - Re-engined KC-135Q models with F108 powerplants.
KC-135R - Base KC-135 models re-engined with CFM International F108 (CFM56) turbofan engines.
C-135 - Military Transport Variant Series Designation.
C-135F - French Export Variants of which 12 delivered; later re-engined with F108 powerplants becoming KC-135FR designations.
707 - Civilian Transport Variant Model Designation.