In addition aircraft are far more susceptible because of their ability to change altitude and associated ambient pressure rapidly.

In contrast, a superpressure balloon will change altitude much less without compensation maneuvres.

"They changed speed, altitude and direction," he said.

'Let me know the instant he changes speed, altitude or direction.'

How do I change altitude when I'm in 'plane' combination.

This beam is connected to the eastern supporting wall, where it can move on a circular iron arc to allow the telescope to change altitude.

If they see it, they are supposed to change altitude or direction quickly.

Planes cannot change assigned course or altitude without permission.

Even the enclosing arc of hylighters appeared more agitated, moving about, changing altitude.

In order to avoid a possible collision, the captain changed altitude.