Awọn wọnyi iwadi mu si ibere ibeere fun awọn CX-Heavy Logistics System (CX-HLS) ni March 1964 fun ohun ofurufu pẹlu kan fifuye agbara ti 180,000 poun (81,600 kg) ati ki o kan iyara ti Mach 0.75 (500 tabi 800 km / h), ati ki o kan unrefueled ibiti o ti 5,000 nautical miles (9,300 km) pẹlu kan payload ti 115,000 poun (52,200 kg). awọn payload ní lati wa ni 17 ẹsẹ m (5.18 m) jakejado nipasẹ 13.5 ẹsẹ (30 m) ga ati 100 ẹsẹ gun pẹlu awọn ilẹkun ni iwaju ati ki o pada nipasẹ awọn ẹhin. awọn ifẹ lati pa awọn ọkọ ofurufu ni eyikeyi ti o wa tẹlẹ ofurufu. awọn engine ti CX-Heavy Logistics System (CX-HLS) ni March 1964 fun ohun ofurufu pẹlu kan fifuye agbara ti 180,000 poun (81,600 kg) ati iyara ti Mach 0.75 (500 tabi 800 km / h), ati ki o kan unrefueled ibiti o ti 5,000 nautical miles (9,300 km) pẹlu kan payload ti 115,000 poun (52,200 kg). awọn payload
Àwọn ilé iṣẹ́ Boeing, Douglas, àti Lockheed