Many fliers refuse to turn off electronic gadgets

Gadget-dependent fliers are turning a deaf ear to flight attendants' instructions to turn off their devices during takeoff and landing, despite decades of government warnings, a USA TODAY investigation shows.

The investigation, which reviewed thousands of pages of technical documents and surveyed hundreds of frequent fliers, also confirms that the worry about electronics on planes is not baseless: The devices emit radio signals that can interfere with cockpit instruments and flight systems. "We really need to get the technical findings out to the public and tell them it's dangerous to use their portable electronic devices in-flight," says Bill Strauss, an electrical engineer whose doctoral thesis at Carnegie Mellon University studied use of electronic devices in-flight. Documents reviewed by USA TODAY include: more than 25 papers by electronics experts; presentations, papers and advisories by government aviation officials in the USA, Canada, the United Kingdom and Europe; congressional testimony; and Boeing research and information for airlines. The investigation also included: a review of government accident reports and airline pilots' incident reports; a survey of more than 900 frequent fliers; and interviews with Boeing, NASA and independent electromagnetic interference (EMI) experts, flight attendants and pilots unions, and college electrical engineering professors. Fortunately for air travelers, the probability of EMI is small, the technical papers say.