1967 December. (Cancelled flight). The first multi-orbit flight and seventh manned flight of the series would have the objectives to demonstrate maneuver in orbit and during re-entry, and a precision recovery. The apogee of the orbit would be adjusted using the transtage engine. During re-entry sustained flight would be made near the thermal limits of the spacecraft, at pitch angles of 40 degrees and roll angles of plus/minus 30 degrees.

• - 1967 December - Dynasoar 9 (cancelled)  Spacecraft: Dynasoar.

  Planned date for seventh manned and first multi-orbit flight of the X-20 Dynasoar.

• Houchin II, Roy and Smith, Terry, Quest, "X-20 (7 articles)", 1994, Volume 3, Issue 4, page 4.

• Godwin, Robert, editor, Dyna-Soar: Hypersonic Strategic Weapons System, Collector's Guide Publishing, Ontario, Canada, 2003.. ISBN: 1896522955. Collection of contemporary documents covering the development and death of Dyna-Soar, as well as a DVD with video of promotional films and systems tests. More at amazon.com...