Shuttle – Early

Phase A

Manned Space Center DC-3
Martin Marietta
McDonnell Douglas
North American Rockwell

Phase B

Grumman
Lockheed / Boeing
McDonnell Douglas / Martin Marietta
North American / General Dynamics

Alternate Space Shuttle Concepts

Chrysler
Grumman / Boeing
Lockheed

Phase B Prime / Double Prime

Notes

ASSC

Grumman / Boeing

The inclusion of the Grumman/Boeing team in the ASSC studies has always been the subject of some confusion. Part of this stems from the fact that their contract was issued by MSC, not MSFC; the contract was also for twice the amount of the other ASSC contracts. In many respects, it appears that MSC decided to issue a third Phase B contract and chose the ASSC to accomplish it.

Jenkins, D. R. (2001). Space shuttle : The History of the National Space Transportation System : The First 100 missions. Cape Canaveral, Fla. : D.R. Jenkins.

Grumman developed several designs under its ASSC contract; the H-33 Orbiter was designed in partnership with Boeing.