Shuttle Landing From the Cockpit: This video looks through the HUD (Heads Up Display) on Atlantis's flight deck. You'll hear flight deck audio of three astronauts interacting. The video starts at about FL830 (83,000 ft), mach 2.5 velocity at 1.1 Gs. You'll hear the term H A C (Heading Alignment Cylinder) used a lot. It's the shuttle's version of a traffic pattern to line up with the runway center-line. It is a circular instead of rectangular pattern. Landing is a team sport, as you'll see.