| 21. | Centralized traffic control was introduced is steps during the early 1970s.
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| 22. | The traffic control is handled remotely from the Oulu railway station.
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| 23. | The Boston Air Route Traffic Control Center is located in Nashua.
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| 24. | Raytheon sells air traffic control equipment to the Federal Aviation Administration.
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| 25. | There was no other form of traffic control on the network.
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| 26. | The 1960s blue air traffic control tower was demolished in 2001.
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| 27. | The aircraft will follow the deployment of air traffic control teams.
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| 28. | The accident investigation found that Air Traffic Control was to blame.
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| 29. | The five controllers are from the Miami air traffic control center.
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| 30. | Has Ukraine released its air traffic control data to the public?
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