Search and rescue workers prepare to load body bags onto a flight to Kalimantan in Pangkal Pinang, Bangka December 30, 2014. Indonesian rescuers saw bodies and luggage off the coast of Borneo island on Tuesday and officials said they were "95 percent sure" debris spotted in the sea was from a missing AirAsia plane with 162 people on board. Indonesia AirAsia's Flight QZ8501, an Airbus A320-200, lost contact with air traffic control early on Sunday during bad weather on a flight from the Indonesian city of Surabaya to Singapore. [Photo/Agencies]

CLUES WHEN THINGS GO WRONG

The plane, whose engines were made by CFM International, co-owned by General Electric and Safran of France, lacked real-time engine diagnostics or monitoring, a GE spokesman said.

Such systems are mainly used on long-haul flights and can provide clues to airlines and investigators when things go wrong.

Three airline disasters involving Malaysian-affiliated carriers in less than a year have dented confidence in the country's aviation industry and spooked travellers across the region.

Malaysian Airlines Flight MH370 went missing on March 8 on a trip from Kuala Lumpur to Beijing with 239 passengers and crew on board and has not been found. On July 17, the same airline's Flight MH17 was shot down over Ukraine, killing all 298 people on board.

On board Flight QZ8501 were 155 Indonesians, three South Koreans, and one person each from Singapore, Malaysia and Britain. The co-pilot was French.

The Indonesian pilot was experienced and the plane last underwent maintenance in mid-November, the airline said. The aircraft had accumulated about 23,000 flight hours in some 13,600 flights, according to Airbus.

U.S. law enforcement and security officials said passenger and crew lists were being examined but nothing significant had turned up and the incident was regarded as an unexplained accident.

Indonesia AirAsia is 49 percent owned by Malaysia-based budget carrier AirAsia.

The AirAsia group, including affiliates in Thailand, the Philippines and India, had not suffered a crash since its Malaysian budget operations began in 2002.

India is waiting to know what went wrong with the missing plane and will investigate if AirAsia India is following all safety procedures, a senior Indian aviation ministry official told Reuters. AirAsia India, a joint venture of the Malaysian carrier, started flying this year and is expanding operations.

The plane's disappearance comes at a sensitive time for Indonesia's aviation authorities, as they strive to improve the country's safety reputation to match its status as one of the airline industry's fastest growing markets.