"A two-engine plane can fly on one engine, but it can't fly too well on no engines," he said.

In June 1992 it plans to introduce the short- to medium-range A330, a two-engine plane that seats 335 and serves a niche between Boeing's 747 and 767.

The 777 is the lone two-engine plane to have been certified by the Federal Aviation Administration to fly extended distances over water without the standard two-year test period.

Shortly before 10:30 A.M., the two-engine plane that was carrying Mr. Bush and the other jumpers could be seen circling in the morning sky.

Bad weather can bring down a two-engine plane as easily as one with one engine, Mr. Collins said.

The C-12 is a military version of a small two-engine plane built by Beechcraft.

A two-engine plane is likely to have twice as many problems as one with a single engine.

If an engine fails in a two-engine plane, the pilot or co-pilot can compensate for the unbalanced thrust by using a foot pedal to deflect the rudder.

The A330 is a two-engine plane that seats 303 passengers and will be used on North Atlantic routes and high-volume domestic routes.

The A330 is intended to compete with Boeing's 767, a two-engine wide-body plane that has been in service for some years.