Τροχιακό HL-10

A 1964 Boeing design for an orbital HL-10 derivative, to be used for space station logistics. This would be launched atop a Saturn Ib. Cargo would be carried up int he adapter, which would be expended; passengers would go up and down within the body of the spaceplane. A heat shield would cover the canopy until after re-entry.

Πηγή: http://www.aerospaceprojectsreview.com/blog/?p=4728