| 21. | The control tower is one of the tallest in North America.
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| 22. | The 1960s blue air traffic control tower was demolished in 2001.
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| 23. | At first I called the control tower to ask what they were doing.
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| 24. | It lost contact with the control tower soon after, said George.
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| 25. | The commotion in the NASCAR control tower begins 30 minutes before the race.
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| 26. | We make routine visits to control towers in all the airports we serve.
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| 27. | The passenger handed it to a crew member who alerted the control tower.
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| 28. | The pilot told the control tower he had a sick passenger.
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| 29. | A new Control tower is in the planning and approval stage.
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| 30. | Nine seconds later, the crew contacted the control tower for the last time.
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