Delta Air Lines on Thursday announced plans to buy 100 new 737-900ER aircraft from Boeing in a move to replace older aircraft in the carrier's fleet over the next seven 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...