All operations of an airliner after its take-off rely on the automatic electronic piloting system. Any interference will affect its precision and cause air accidents. In order to maintain air safety, according to Aviation Act Clause 43, any use of electronic devices that might interfere flight communication system is prohibited on the flight. Violators shall be sentenced to imprisonment of at most 5 years, laboring, or capital fine of no more than 150,000. Life imprisonment or 7 year plus term-imprisonment will be imposed if any death is incurred. Prohibited electronic appliances include mobile phones, CD players, remote controllers, pagers, laptop computer and its accessories, FM radio, shave, radio transmitter, video recorder, video player, TV sets, video games, calculators, and camcorders.