Radar contact for the flight was "spotty" and there were times the plane was beyond the sweep of the folks on the ground. Radar signals are straight line and the earths curve causes "holes" in the signal. With all of the flight changes it almost had to be "suicide by pilot" or a hijacking that went wrong. Seabed sensors would have picked up the noise of a crash but no government would divulge such information. Admitting such information would reveal the existence of surveillance devices that "don't exist". Rather odd that the plane would go down in one of the most inaccessible spots on the planet. But as James said the "theories are a dime a dozen." We have had light plane crashes in the US that took months/ years to find the wreckage so it is not beyond the realm of possibility to loose a triple 7 (as big as it is) in the area in question EXCEPT that when commercial flights leave the "contact" area of one ATC they are passed on, by radio contact, to the next ATC in line. You do not leave one controllers airspace and enter another without talking to somebody, in a pilots vernacular, you are "passed off". Odd that there has been no mention of that occurring. Also odd that the pieces of debris they are finding have not yet been identified as the flight in question, there are thousands of ID numbers on the multitude of parts on an airliner. Makes me wonder if the debris & transponder echo could have been "faked" to mislead the search. Some part of the story just hasn't seen the light of day yet. Theory # 1001 ?? Theory #1002 is that there were items of "extreme sensitivity" being smuggled aboard the flight and it was brought down intentionally. Sounds like Tom Clancy wrote that one. Its a big ocean so we may never know the true circumstances.