It shall be unlawful for any person to operate at all times any portable electronic devices which transmit radio signals while in the aircraft. These include, but are not limited to amateur radio transceivers, citizens band radios, pagers, cellularphones, text messaging devices, remote control devices, other electronic devices and all other types of portable radio transceivers, whose operation in flight the carrier or commercial operator hereafter determined may likewise endanger the safety offlight. An aircraft is in flight from the moment all its external doors are closed following embarkation until any of such doors are opened for disembarkation.