Nearly 60% of FAA buildings are more than 30 years old, according to a report by the Transportation Department's Inspector General, and they suffer from problems that range from wet ceilings to foggy windows. The survey of 420 air traffic control centers found no threats to public safety, despite the physical condition of the facilities. The FAA estimates its maintenance backlog stands at $240 million and could grow to $380 million within a dozen years.

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