Well... it is not a question if it works, but as long as I know it is forbidden to use it in airplane during flight. Bluetooth is considered a two way radio... so it is requested to keep turned off during the duration of the flight.

There are only very few airlines with WiFi on board. (Lufthansa few years ago? Are they still doing this?) WiFi (B and G) uses the same frequency band than Bluetooth... so it would be ridiculous if they ban Bluetooth if WiFi was allowed, but in other cases (No WiFi) I do not see how Bluetooth would be allowed?

Maybe someone can shed some light on this issue...

EDIT: Just did dig deeper on this and found out these rules of different airlines about their accepted device use during flight:

British Airways: Allow use of Bluetooth devices on their planes.
American Airlines: Forbid Bluetooth, as well as use of any GPS device!
Finnair: Allow GPS devices but forbid Bluetooth.
Lufthansa: Couldn't find information.
United Airlines: Bluetooth nor GPS not mentioned, but forbid use of any AM or FM transmitting device.

I haven't checed other airlines... but may do later...