lol if wifi took out or messed up planes, terrorists would have a field day. would a bag full of devices that are just regular items that transmit signals, say a cell phone or two, psp with wifi on, laptop, palm pilot, etc, but all things on in a bag and turned on (thats totally legal in every way) mess up a plane to that degree?
no...im HIGHLY sure that anything in the 4.7ghz (wifi) spectrum would mess up any of the planes on board equipment.
Sorry but im a internet tech and i can tell you there is'nt any common wifi that runs on 4.7Ghz. the most common is 802.11B/G and thats 2.4Ghz definatly NOT 4.7.
also 5.7Ghz is common and 900Mhz for getting signal through solid objects.
never used or seen any 4.7Ghz wifi myself but i guess it could exist.
and NO it(psp) wont cause interferance with normal operation of a plane even with wifi on, just follow rules and keep ALL electronics OFF during take off and landing. the ban on using mobile phones on a plane is fedral and i heard they are thinking of lifting that ban so you can use your phone on a plane. ive noticed they tell me i can use my phone right after the plane lands on the tarmac now.