1.  As demand falls off they are parking older planes.

2.  Boeing attributed the deterioration to expectations that it will sell more of its new models, which command lower margins than older planes.

3.  Adding fly-by-wire ability to older planes would be wildly expensive.

4.  Airline experts say older planes are much more expensive to operate than new models because they use more fuel and require larger cockpit staffs.

5.  In practice, experts say, if airlines had to replace a lot of wiring on older planes it would be a death sentence for the planes.

6.  Investigators then looked at wiring on more than a half dozen other jets and found similar problems, especially on older planes, he said.

7.  Its new aircraft are much quieter than the older planes used by many startup carriers.

8.  Lie-Nielsen re-engineers designs, rather than reproducing them, drawing on his familiarity with older planes to make improvements.

9.  Many airlines, including established majors, fly older planes.

10.  Most of the fleet reductions are in older planes that cost more to operate.