Northern Command Keeps Tabs On Commercial Air Traffic

PETERSON AIR FORCE BASE, CO - DECEMBER 9: Around-the-clock crews monitor U.S. skies from the command center of the Northern Command December 9, 2002 located deep within Cheyenne Mountain at the foot of the Rocky Mountains near Colorado Springs, Colorado. The Cold War-era station now monitors homeland security as well as foreign nuclear threats. Every commercial plane in U.S. air space is monitored from the center. Crews reporting unruly passengers or planes that drop from radio contact are given special attention since the September 11, 2001 terrorist attacks. (Photo by Kevin Moloney/Getty Images)