Sir Tim Clark, chief of the Emirates airline, the world's biggest commercial carrier has expressed ambiguity on the official line that the missing airplane MH370 is in the Indian Ocean.

The international search for the Malaysian airlines aircraft will head further south in this week.

A multi-national underwater search operation lays due emphasis on the Southern part of the Indian Ocean, off the West coast of Australia, post the disappearance of the aircraft. After seven months, the search is progressing alongside the seventh bend of 60,000 square kilometers.

The Emirates Airline chief asserted that in the history of civil aviation, there has not been even one instance of an airplane water crash that was not "at least 5 or 10 per cent trackable" apart from the one incident in 1939 which involved Amelia Earhart.

Mr Clark said in a statement, "MH370 was, in my opinion, under control, probably until the very end. Our experience tells us that in water incidents, where the aircraft has gone down, there is always something".

He alluded to a number of electronic signals that communicated between the Boeing 777-200 and satellite locators which culminated over the Indian Ocean, apart from which, no other thing is indicative of the plane being in the Indian Ocean, as the officials said.

Mr Clark also suggested that the aircraft makers should come up with a way to make it impossible to deactivate the aircraft's transponders and Aircraft Communications Addressing and Reporting System (ACARS) which communicates consistent reports of the plane's condition "irrespective of who is controlling the aircraft".

According to the Malaysian flight officers MH370's ACARS was for the last time transmitted at 1.07am on March 8, adding that the exact timing of the communication systems shutdown was not known.