The agency also ordered airlines and airports to tighten controls on restricted areas, improve X-ray equipment and increase security training, and most of them responded.

The F.A.A. ordered airlines not to fly the plane until certain engine parts were replaced and their power output restricted.

In response to those two incidents, the F.A.A. ordered airlines using this type of blade to check for cracks with ultrasonic tests.

The FAA ordered airlines to inspect and lubricate the jackscrew more frequently.

Just last week the Federal Aviation Administration ordered airlines to make special inspections and repairs of older planes, which are likely to require additional technicians.

In the last seven years, the F.A.A. has issued more than 50 directives, ordering airlines to inspect wiring and replace certain parts.

It would codify current practice by ordering airlines to permit, but not require, infant safety seats.

This March, the aviation administration ordered airlines to inspect the valve periodically.

Even after the courts ordered airlines to hire men, they balked.

Later, the Transportation Department ordered airlines to inspect all electronic items carried aboard.