Wow, LastChild, you're really reaching with that one.
ETA: No one has said that controlling a plane remotely is impossible in principle. The issue is, modifying a commercial airliner to allow this would require the dedicated work of thousands of people, every last one of whom would need to be trusted to act treasonously to his country and keep quiet about it. Every single one. Thousands.
You mean like how in your conspiracy theory everyone in al-Qaeda would need to keep quiet about it? Every single one? Thousands?
Or doesn't it work the same way for your story?