If I were trying to sneak a jet into the US, I'd try to disguise myself as a private flight. Problem is, it's a 777 and not a Gulfstream or a Learjet. The difference is rather noticeable to anyone within visual range, which is going to happen sooner or later. And you'd have to fake a passenger manifest.
It's a plane that needs 6000 feet of good concrete to land, closer to 10,000 if you want it to actually take off again. Which is why I'm convinced it didn't land. This is not something you can put down on some drug cartel's dirt strip. There aren't a lot of places that have somewhere to hide a 777 that don't also have a ton of people around.That's a great point, though. Where could it land without some other country's governmental cooperation?
Very very weird.
Fun fact: the engines on this thing are (about) the same diameter as the fuselage of a 737.