From the NYT:

Passengers may soon hear a new in-flight announcement: “You can now log on.”

Starting next week and over the next few months, several United States airlines will test Internet service on their planes.

On Tuesday, JetBlue Airways will begin offering a free e-mail and instant messaging service on one of its planes, while American Airlines, Virgin America and Alaska Airlines plan to offer broader Web access in coming months, probably at a cost around $10 a flight.