An Air Asia flight from the Indonesia city of Surabaya to Singapore has lost contact with air traffic control, reports say.
Indonesian media say 162 people were on board.
The aircraft, flight number QZ8501, lost contact with Jakarta air traffic control just after 06:15am local time, a transport official told local media.
The official, Hadi Mustofa, said the plane had asked for an unusual route before losing contact.
An AirAsia flight from Indonesia to Singapore has lost contact with air traffic controllers, according to local media.
Transport Ministry official Hadi Mustofa said the aircraft, flight number QZ 8501, lost contact with the Jakarta air traffic control tower at 6.17am local time.
He said the plane had asked for an unusual route before it lost contact.
An Indonesian transport official confirmed the plane was an Airbus 320-200 and that 162 passengers and crew were on board.
A statement on AirAsia's Facebook page said: "AirAsia Indonesia regrets to confirm that flight QZ8501 from Surabaya to Singapore has lost contact with air traffic control at 0724hrs this morning.
"At the present time we unfortunately have no further information regarding the status of the passengers and crew members on board, but we will keep all parties informed as more information becomes available.
"The aircraft was an Airbus A320-200 with the registration number PK-AXC. At this time, search and rescue operations are in progress and AirAsia is cooperating fully and assisting the rescue service.
"AirAsia has established an Emergency Call Centre that is available for family or friends of those who may have been on board the aircraft. The number is: +622129850801
BREAKING NEWS: Lost AirAsia flight to Singapore had 149 Indonesians, 3 Koreans, 1 Singaporean, 1 Briton and 1 Malaysian on board: Indonesia TV