The fate of MH370 is "downright suspicious" and the Malyasia Airlines jumbo may not even be in the Southern Indian Ocean, according to Emirates chief Tim Clark.
Clark called for every "fact" about the tragedy to be challenged as investigators comb an area of the southern Indian Ocean seabed. He also voiced concern that efforts to get the truth might slacken, leading MH370 to become an unsolved mystery.
In a frank interview with German magazine Der Spiegel, Clark raised significant doubts about the official version of events, according to which MH370 flew over the Indian Ocean on autopilot until it ran out of fuel and crashed in to the sea.
That theory underpins the entire search operation, which has recently resumed following delays.
Clark said: "My own view is that probably control was taken of that airplane. It's anybody's guess who did what. We need to know who was on the plane in the detail that obviously some people do know.
"We need to know what was in the hold of the aircraft. And we need to continue to press all those who were involved in the analysis of what happened for more information."
Revealing he feels "totally dissatisfied" with the progress of the investigation, Clark said he remains to be convinced that MH370 was even to be found in the southern Indian Ocean.
"I am saying that all the "facts" of this particular incident must be challenged and examined with full transparency. We are nowhere near that. There is plenty of information out there, which we need to be far more forthright, transparent and candid about.
"Every single second of that flight needs to be examined up until it, theoretically, ended up in the Indian Ocean — for which they still haven't found a trace, not even a seat cushion. Our experience tells us that in water incidents, where the aircraft has gone down, there is always something.
"We have not seen a single thing that suggests categorically that this aircraft is where they say it is."
Two hundred and thirty nine passangers died when MH370 vanished in March, en-route to Beijing from Kuala Lumpar.
Leading the search for the Malaysia Airlines craft is the Australian Transport Safety Bureau.