They must’ve practiced the fine art of crashing a 777 into the ocean without leaving a trace, then. It could be buried in Himalayan snow too, I suppose.
Or, they must've practiced the fine art of finding a mile-long, pirated and abandoned airfield somewhere in South Asia, or Indonesia, where they can land such a jet, and have practiced the even finer art of hiding it from military radars or the local population as it landed. And of course, they must also have had the well-planned cooperation of scores of ground-crew at destination to manage everything from hiding the aircraft in a hangar, to dealing with every single passenger. Or they also have managed to kill every passenger upon landing to avoid every single one of them from turning on an iPhone or iPad which could be tracked, much less deliberately send out a message.
Tell me, whose scenario is more far-fetched?