Aviation experts told a congressional panel Wednesday that the NextGen air traffic control system is threatened by poor planning, jurisdictional issues and wrangling over costs. Aerospace Industries Association President and CEO Marion Blakey said incentives were needed to convince airlines to invest in needed cockpit equipment, because a "critical mass" is needed before the system is viable. "Aircraft are not required to be equipped with ADS-B technology until 2020," she pointed out -- seven years after the completion of ground stations.

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