Do these airlines with iPads use any form of moving map (like Jepp FD) with a bluetooth GPS?
QANTAS has decided (after extensive testing - with no published or freely available results) that bluetooth (~GPS) on the flight deck only interfere with navigation instruments, and therefore can't be used. Bluetooth in the cabin for the use of 200-400 odd people is however perfectly acceptable.
As you can imaging such results may be perfectly true - and it is their train set as such - but given it is not banned throughout the cabin - one would possibly be a little skeptical about the validity of the testing.