Earlier quoted context omitted.
Sure it does. To the cellphone networks. (Unless the aircraft carries its own picocell). The big problem with cellphones on planes is that they overwhelm the signalling networks on the ground - when the carrier tries to determine which cell is best suited to handle your call, it basically polls the neighbouring cells for the received signal strength from that particular phone. When you're on a plane, your phone is se…
I'm skeptical that it really causes trouble for phone networks. In my experience flying small airplanes, getting a signal is easy below about 4,000ft, starts getting spotty up to 6,000ft, and is basically impossible above that. Which makes sense: antennas at the cell will be aimed sideways, not up, so the only cells you might be able to talk to would be really far away. And this is in a fiberglass airplane that's bas…
There's enough radio transparent openings in an aircraft fuselage for it to be a reasonably inefficient faraday cage - say, windows, for instance. (Or are those portholes on an aircraft, too?)