21.   He joined NASA initially as flight controller at the Johnson Space Center.

22.   If a second gyroscope were to fail, the flight controllers would be unable to control the spacecraft reliably.

23.   If raising the rover, more power cycling or other solutions restore communications, then flight controllers expect to turn their attention to deploying the rover.

24.   If flight controllers elect to close a valve on the common fuel line to stop the leak, the backup capability is eliminated.

25.   In Geneva, where the trip was monitored at a makeshift center in the Geneva airport, flight controllers broke open champagne to celebrate the record journey.

26.   In vain, Air Force fighters and flight controllers tried contacting the pilots as the plane flew steadily northwest to its doom.

27.   In the hours after the explosion, flight controllers settled on a plan.

28.   In the last stages of the expedition, he was aided by sympathetic Argentine Air Force flight controllers.

29.   Indeed, with each passing hour, little hope remained that flight controllers would somehow establish radio contact with the missing polar lander.

30.   Jean-Luc Michel is a clean-cut guy, a former air force flight controller who is married, has two children and is crazy about planes.