| 31. | It notifies air traffic controllers visually and audibly of potential problems.
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| 32. | The causes included poor visibility and confusion by air traffic controllers.
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| 33. | Both planes were flying without the guidance of air traffic controllers.
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| 34. | Previous air traffic controller strikes in Rome have grounded most flights.
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| 35. | They belonged to the now-defunct Professional Air Traffic Controllers Organization.
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| 36. | Stanislav Dasmanov, an air traffic controller in Novosibirsk told TVS.
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| 37. | That includes chip designers, graphic artists and air traffic controllers.
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| 38. | But air traffic controllers have yet to assess their facilities.
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| 39. | You can hear the frustration in the air traffic controllers'voices.
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| 40. | Air traffic controllers cleared the jetliner to return to Miami.
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