Flight Study: In-flight cell calls pose risk to planes 'Hello? I'm on the plane': Ryanair passengers will be able to use mobiles on board – at a price 47 CFR § 22.925: Prohibition on airborne operation of cellular telephones External links 14 CFR § 91.21: The FAA rules regarding portable electronic devices Advisory Circular 91.21-1A: Use of portable electronic devices Cell Phones Interfere with Plane Instruments: BUSTED, summary of an episode of MythBusters Aviation risks Mobile telecommunications