One new feature shown in the iPhone 2.0 guided tour is the ability to independently turn on Wi-fi after you've switched your iPhone into "Airplane mode". Normally, with Airplane mode, the iPhone turns off both its cellular and Wi-fi transmissions to prevent any inteference with the plane's navigation system.
The need for Wi-fi on a plane is a rather new feature with a company called Gogo starting to offer Wi-fi internet access on domestic flights beginning this summer.
Gogo will be launching on three American Airline routes in July, with plans to expand to several other major U.S. airlines next year. The cost for the service is $12.95 for flights of three hours or longer and $9.95 for shorter trips.