1.   The US shuttle fleet had been grounded since April due to the cancellation of Atlantis and Columbia shuttle flights because of fuel leaks.

2.   Air France grounded its fleet of five Concordes immediately after the crash and said the supersonic aircraft would remain on the ground indefinitely.

3.   British Airways grounded its fleet of seven Concordes on Tuesday after learning that the airworthiness certificate would be revoked Wednesday.

4.   Great Lakes voluntarily grounded its fleet Friday in response to Federal Aviation Administration concerns about its maintenance and record-keeping.

5.   It would not provide any near-term alternative if the shuttle fleet was grounded for years, which happened after the Challenger loss.

6.   Shuttle wiring problems kept the fleet grounded, and ultimately led to the delay of Discovery launch to fix the Hubble telescope.

7.   The department grounded its fleet of helicopters while federal officials launched an investigation into the cause of the crash.

8.   The helicopter fleet has been grounded by mechanical problems, and angry Mexican generals are sharply cutting the number of troops they will send to train.

9.   The Washington Post reported Monday the FAA told Emery to ground its fleet voluntarily or face possible FAA action.

10.   Under department policy all helicopters in the fleet are inspected after such incidents, grounding the fleet on Sunday morning.