The Fieseler Fi 333 was a prototype transport aircraft developed by Fieseler, and backed by the Luftwaffe. The aircraft was to use detachable pods of varying sizes to carry cargo, a system that would allow a rapid turnaround on the ground. The very tall braced undercarriage was made unretractable so that the fuselage would be able to take the strain of the heavy cargo.
The cargo pod system was tested on several other Fieseler and Messerschmitt aircraft, but shortly after these tests the project was cancelled.
Posteriorly, the American Fairchild did the XC-120 Packplane an experimental transport aircraft and did first flown in 1950. It was developed from the company’s C-119 Flying Boxcar, and became unique in the unconventional use of removable cargo pods that were attached below the fuselage, instead of possessing an internal cargo compartment.