It took me almost two hours to get a line on them, to make certain they hadn't left by air.

There seemed no way out by air or on the ground.

By air, it won't take more than an hour and a half.

By earth and air, let him live up to the task.

The only way to get here is by air or boat.

And there is only one way to leave it: by air.

They have travel a lot not just by air or sea.

It was easy enough to get to by air, but few made the trip.

The main transportation to the city is by air and land.

They will arrive over the next few days by air.