Although you can only use them to fly for about twenty seconds.

"What are the differences between this plane and the one you used to fly?"

So we use the Northern to fly to the future.

Flying gives the vehicle using it to fly for a short while.

If they were any longer, you could use them to fly.

He could use it to fly back home any time.

"Did you know he used to fly one of my suppliers, when first I began serving energy plants?"

However, many airlines still used the 747 to fly across the Pacific.

Although these designs are very different, they both use air resistance in the same way to fly.

"No, but we think my father could use it to fly."