The biggest safety threat facing
airlines today may not be a terrorist with a gun, but the man with the portable
computer in business class. In the last 15 years, pilots have reported well over
100 incidents that could have been caused by electromagnetic interference. The
source of this interference remains unconfirmed, but increasingly, experts are
pointing the blame at portable electronic devices such as portable computers,
radio and cassette players and mobile telephones. RTCA, an
organization which advises the aviation (航空) industry, has recommended that all
airlines ban (禁止) such devices from being used during "critical" stages of
flight, particularly take-off and landing. Some experts have gone further,
calling for a total ban during all flights. Currently, rules on using these
devices are left up to individual airlines. And alt A. a new regulation for all airlines B. the defects of electronic devices C. a possible cause of aircraft crashes D. effective safety measures for air flight
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