N'afọ 1963, United States Air Force malitere usoro nke ọmụmụ oru ngo na a nnọọ nnukwu usoro iga ugbo elu. Ọ bụ ezie na C-141 Starlifter na-ẹkenam, ndị ọchịchị kweere na a ukwuu ibu na ndị ọzọ nwere ike ugbo elu dị mkpa, karịsịa na-ebu ibu na-agaghị dabara ọ bụla ẹdude ugbo elu. Ndị a ọmụmụ mere ka mbụ chọrọ maka CX-arọ lọjistik System (CX-HLS) na March 1964 maka ụgbọelu na a ibu ikike nke 180,000 pound (81,600 n'arọ) na a ọsọ nke Mach 0.75 (500 ma ọ bụ 800 km / h), na unrefueled nso nke 5,000 nautical kilomita (9,300 km) na a payload nke 115,000 pound (52,200 n'arọ). The payload nwere na- 17 ụkwụ n'obosara bay (5.18 m) site 13.5 ụkwụ (30 m) elu na 100 ụkwụ ogologo na ibo ụzọ na azụ na n'ihu na azụ.
Boeing, Douglas, na Lockheed