HL-20 Mockup research, spacecraft, spaceplane Add comments Oct 112015 Recent photos of the HL-20 lifting body spaceplane mockup on display at the Wings Over the Rockies aviation museum near Denver. An attempt at art on the photographers part, I suppose. Leave a Reply Cancel reply Your Comment You may use these HTML tags and attributes: <a href="" title=""> <abbr title=""> <acronym title=""> <b> <blockquote cite=""> <cite> <code> <del datetime=""> <em> <i> <q cite=""> <s> <strike> <strong> Name (required) E-mail (required) URI Save my name, email, and website in this browser for the next time I comment. Δ