Russian Sukhoi Superjet 100 with about 80 passengers is missing over Indonisia.
It went missing only 20 minutes after taking off.
Hijacking, Crash into mountains and other possibilities are being viewed as the reason for the loss.
It is claimed that the modern tech of the plane would suggest the possible crash might be due to human error.
The aircraft is said to be the latest in technology and with all sorts of vision enhancement that could foresee mountains several miles away.
It is said to be one of the best machine manufactured by Russia after the collapse of Soviet Union and the cold war.
Indonesian authorities claimed many helicopters which had gone searching had returned without any sign of traces of the craft.
“The plane disappeared from the radar around the Bogor area. We are still looking for it and we are uncertain whether it crashed,” said Gagah Prakoso, spokesman for the national search and rescue agency.
“At 2:50 pm it dropped from 10,000 feet (3,000 metres) to 6,000 feet,” the agency added in a text message to AFP.
Transport ministry spokesman Bambang Ervan said the descent was intentional, and that the pilot was trying to head back to the Halim air field.
He said the flight went missing “in a mountainous area 10 nautical miles from Bogor military airbase.”
The rescue agency spokesman said it was carrying 46 people but Dimitry Solodov, press attache at the Russian embassy in Jakarta, said he could confirm 44 on board, eight of them Russian airline crew members, and some journalists.
Herry Bakti, head of the transport ministry’s aviation division, said the aircraft was on the second of two demonstration flights, and those on board were invited guests.
The Sukhoi Superjet, a mid-range airliner that carries up to 100 people, has been presented as Russia’s contender to compete in the international civil aviation industry.
After its maiden flight in 2008, deliveries were delayed several times, but the planes are already in use with Russia’s largest carrier Aeroflot and have been ordered by smaller airlines in Russiaand abroad.
It claims to offer lower operating costs than rival aircraft made by Brazil’s Embraer and Canada’s Bombardier.
The official Antara news agency said that domestic Indonesian carrier Kartika Airlines and regional Sky Aviation had both placed orders for the Sukhoi Superjet.
Addition: Times of India