^^ Bluetooth and IR doesn't cause interference problems with aircrafts. Bluetooth is too weak and IR works on totally different principles (uses light instead of radio waves). That's why disabling them doesn't make sense. And bluetooth can be useful on board a flight for example to listen to music using wireless headset, transfer data to your laptop, etc. Thats why i was wondering why SE decided to disable them in flight mode.
Btw @Stick, don't let my post and my new avatar fool you. It'll take a lot more than that for me to become a FAN of any company.