The C-141B is a "stretched" C-141A with in-flight refueling capability.
The stretching of the Starlifter consisted of lengthening the planes 23 feet 4 inches (7.11 meters).
The added length increased the C-141 cargo capacity by about one-third, for an extra 2,171 cubic feet
(62.03 cubic meters). The lengthening of the aircraft had the same overall effect as increasing the
number of aircraft by 30 percent. The C-141A, built between 1963 and 1967, was AMC's first jet aircraft
designed to meet military standards as a troop and cargo carrier. The development of the B model was
the most cost-effective method of increasing AMC's airlift capability.
A universal air refueling receptacle on the C-141B, with the ability to transfer
23,592 gallons (89,649.6 liters) in about 26 minutes, means longer non-stop flights and fewer
fuel stops at overseas bases during worldwide airlift missions.
The C-141 force, nearing nine million flying hours, has a proven reliability and
long-range capability. In addition to training, worldwide airlift and combat support, the C-141 has
amassed a laudatory record in response to humanitarian crises.
The C-141, with its changeable cargo compartment, can transition from rollers on
the floor for palletized cargo to a smooth floor for wheeled vehicles to aft facing seats or
sidewall canvas seats for passengers, quickly and easily, to handle over 30 different missions.