Flight delays have beset the U.S. national airspace system. In 2007, more than one-quarter of all flights either arrived late or were canceled across the system. The FAA is making substantial investments in transforming to a new air traffic control system -- the Next Generation Air Transportation System (NextGen) -- a system that is expected to reduce delays over the next decade. This report explains the extent to which: (1) flight delays in the U.S. national airspace system have changed since 2007 and the contributing factors to these changes; and (2) actions by the FAA are expected to reduce delays in the next 2 to 3 years. Includes recommendations. Charts and tables.