Anthony Serrone, Age 12, Of Corona, N.Y.,, For his question:

What is a jet stream?

No one knew about the jet streams until they were discovered by high flying pilots in world war ii. They are long, narrow ribbons of strong winds that blow seven or eight miles above the ground. The tunnel is a flat oval, about 300 miles wide. The outer winds blow at perhaps 50 miles an hour. The breezes hurtling down the center of a jet stream may blow at 150 miles an hour or faster.

From time to time, jet streams weave high across the pacific. Others sweep aloft over the atlantic. When a pilot flies with a jet stream, he has a powerful tail wind to help him; but when he flies against one of these wind tunnels, he is fighting a powerful heard wind.