Airline passengers who sneak in cell phone calls, play with gaming devices or listen to their mp3 players during takeoff or landing probably won't cause a plane crash, but they may risk a confrontation with flight attendants. Federal agencies and airlines typically err on the side of caution — even though researchers and aircraft companies have found almost no direct evidence of cell phones or other electronic devices interfering with aircraft system s Frequent flyers know the familiar drill of only using certain electronic devices at cruising altitudes. The Federal Aviation Administration (FAA) asked the RTCA, an independent industry standards organization, to study the issue of electronic devices on airplanes in 1992. The RTCA found no interference and eventually recommended allowing the use of laptops, gaming devices and music players. Still, it suggested the precaution of banning the use of any and all devices during the critical takeoff and landing phases. Boeing also i...