Same freq (but lower power) as Connexion by Boeing http://www.connexionbyboeing.com/ which uses WiFi to provide Internet service on aircraft.

People fly on airplanes every day with Bluetooth enabled phones w/o turning them off. If an airplane is in the slightest vulnerable to these signals, it should not be flying. Any airline flying such an aircraft (even if it mandates turning off Bluetooth, etc. devices) would be criminally liable if an accident occurred because of interference, as it is so obviously foreseeable.

If it's not safe to use a Bluetooth device, the airline you are flying is potentially criminally negligent, IMHO. IANAL.

Doesn't mean that you should use it though.