[TankerKC]

With the exception of filming for training, it is against federal regulations for pilots or passengers to use such devices during takeoffs and landings, as they could interfere with instrument and landing system navigation radios.

I've never seen evidence that this is true. Has anyone else seen interference?

[TSgt]

As someone who worked as an electronics troop in the Air Force I am very familiar with EMI and can tell you unequivocally that this is Bravo Sierra.

[GingisK]

Has anyone else seen interference?

It is a false claim. Avionics is very well made. I suspect that they are actually doing, without the honesty, is attempting to prevent potential terrorists from signalling departure events or listening to ground/approach control radio. That would help to thwart coordination between aircraft.

Is dosen't prevent the same thing from occuring in the gate house, so now you know why only ticketed passengers can pass security.