Column: Congestion prompts carriers to add time to their schedules

Congestion has forced airlines to add time to their flight schedules, the Wall Street Journal's Scott McCartney writes. He notes that the amount of time airlines allot in their schedules for flights is about 10% greater than in 1997. Aging air traffic control equipment prevents carriers from flying the most efficient routes and contributes to airline delays, McCartney writes. Experts say an FAA modernization program that includes advanced navigation technology will lessen delays.

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