Aeroplane mode disables all the wireless transmission functions on a mobile device, but still enables travellers to use it to take pictures, play downloaded games, listen to music or watch TV shows. It also helps extend the battery life.
Regulations in many countries prohibit the use of devices that transmit signals on commercial aircraft. A typical tablet communicates with several mobile towers to maintain a connection and, if the towers are far away, the tablet has to boost its signal which is believed could interfere with an aeroplane’s sensors and cause issues with sensitive navigation equipment.