Long time blue! Where did you get hijacked to !😆The Universe is too vast not to have any form of intelligent life out there. All the same applying Occam's razor we need to rule out the simpler possibilities like human error, sabotage, shortcomings of current technology in detecting the aeroplane that could have fallen anywhere in the vast oceans. The best technology available today may not be up to the task and it is difficult to say that all available information has been truthfully revealed in its entirety by the investigating agencies. The aliens suspects would have to wait till human suspects or mechanical failure is ruled out.