Is there WiFi in the air on a plane?

It depends on the airliner, the route, and the amount of time in the air. For transatlantic flights, or over sea flights, there usually is though you would have to pay. I know Delta Airlines has WiFi on long flights, and British Airways, and I am sure other airliners do as well.

If you know the airliner you are flying with, you can go to there website and look it up there, or e-mail the airliner. You would need to pay for the WiFi and, of coarse, need to have your own laptop with you on board the plane.