They are particularly useful when a high rate of descent is required or the aircraft needs to be retarded.

Modern turbocharged aircraft usually do not need to cool the incoming air.

The American aircraft would not need to use their radars to find our planes.

During flight, the aircraft needed to have an elevated angle of attack, so as not to lose altitude.

In fire support, the aircraft does not just need a position to destroy the target.

Very shortly we'll be needing every aircraft which can fly.

A formidable aircraft, and one their Eagle drivers needed to treat with respect, but not invisible.

All aircraft entering and leaving the Museum will need to take this route, through to the only large capacity doors in the complex.

However most other birds and all powered aircraft need a source of propulsion to climb.

This way, the second aircraft will not need to wait in the air.