Creating the crowded skies was no small achievement.

An early launch was dangerous, given the crowded skies.

It was becoming a crowded sky again.

Under the huge, crowded sky, she felt small, humbled.

One night, the captains made love under that crowded sky.

This was to assist with identifying squadron aircraft out of a crowded sky to form up on during the daylight missions.

From out of the crowded sky came a shapeless thing colored a dead yellowish brown.

Who has the most airplanes in today's crowded skies?

That problem, too, was especially severe in the crowded skies around Chicago.

But it was a crowded sky, despite that immensity.