Doing some of my airplane learning, I have come across a point many times that the engines for the Boeing 747 (at least partially) came from Boeing's competitor to the C-5 Galaxy. What was this plane that Boeing had made to compete with the C-5?

  • $\begingroup$ I'm not getting this question, the C-5 is military and the 747 is civilian. Closest thing is the C-17 GlobeMaster III I think. $\endgroup$
    – Ron Beyer
    May 17, 2016 at 0:42
  • $\begingroup$ @RonBeyer I am asking about Boeing's competitor for the C-5 contract before the C-5 was. It is just like the YF-23 was the competitor to the now F-22. $\endgroup$ May 17, 2016 at 0:45
  • $\begingroup$ According to the book The C-5A Scandal the 747 came out of Boeing's failed bid for the C-5 contract. $\endgroup$
    – radarbob
    May 19, 2016 at 4:30

2 Answers 2


In 1964 the US Air Force awarded study contracts for a new cargo aircraft to Boeing, Douglas and Lockheed. The aircraft was called CX-HLS. ( cargo experimental - heavy logistics system)

Lockheed won with the C-5A design. Boeing's design was never built but would have looked like this:

enter image description here

source: Widebody Aircraft Chronology

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Source: Boeing archives

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  • 1
    $\begingroup$ Based on the TDPRI link, it appears that Boeing called theirs the "C-X", which seems pretty darn generic... $\endgroup$
    – FreeMan
    May 17, 2016 at 12:21

Boeing called the aircraft CX-HLS( Cargo Experimental - Heavy Logistics System). It never entered production though.

The below image is of a scaled down model of the CX-HLS.

Boeing CX-HLS Model at Boeing Corporate Archives - 1963/64 Source: Boeing Archives - Bellevue, Washington USA

Details about the CX-HLS can be found here


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