The enormity of the Serdobsk tragedy intruded into Jake's thoughts even as he worked on holding course and altitude.

I'm only three miles away now, holding altitude at four thousand feet.

No, coming round still more, making a long east-west elipse, and holding altitude now.

The autopilot held altitude while airspeed decayed rapidly.

Still curious-but resigned to remaining so, this day-she turned back, holding altitude and pushing the car near to top speed.

Snoopy One held position and altitude, just under the visual horizon from the "enemy" formation, about one hundred miles away.

All you need to do is get your speed up enough to hold altitude.

They have trouble holding altitude but make it back after a long, tense flight over hostile territory.

At about 10,000 feet, he said, he was able to hold altitude and began to stabilize the plane.

After using two hours worth of fuel it could maintain height on one engine alone, or equivalently hold altitude on half power with two engines.