Three blimps flown by DirecTV, Horizon Blue Cross Blue Shield and Hangar One Vodka will race up New York's Hudson River on Sunday in the first competition of its kind in 25 years.
Diane Sawyer gets an unprecedented look inside the E-4B Nightwatch, aka the Doomsday Plane, the 747 built to keep the nation's command and control structure operational from the air if ground bases are rendered useless by a nuc...