The synchronized automatic pilot kept the vehicles at a constant altitude of 100,000 feet and changed the course as they circled above the planet.

At that point, the aircraft will return to level flight at a constant altitude.

His second 360 had been made holding a constant altitude.

In a fair fight, one-on-one at a constant altitude, the Tomcat doesn't stand a chance.

Balloons meant to stay at a constant altitude for long periods of time are known as transosondes.

It uses potent engine thrust to maintain approximately constant altitude through the entire move.

The lander's going to be approaching at a more or less constant altitude.

The spike would hold the lander at a constant altitude, but the net was moving.

If the dirigible displaces exactly its weight, it hovers at a constant altitude.

A flying car is subtly different from a hovercar, which flies at a constant altitude of a few meters above the ground.