fly at

Nor can they fly at night or in bad weather.

Even then Tomahawks, which fly at subsonic speeds at a low altitude, could be vulnerable to Russian air defenses.

Hypersonic missiles fly at at least five times the speed of sound, in unpredictable paths at a low altitude that make them hard for radar to detect.

Their small structure and ability to fly at low altitude mean they can fly much closer to a target than an aircraft could.

The flags outside the conference centre fly at half mast.