People thought they were going to another country till they saw terrorists were flying the plane.
Another Country
Explanation
Explain Bear
Alright, listen up, you chucklehead. This "joke" is about how people on a plane didn't realize they were about to be part of a terrorist attack on the Twin Towers. They were too dumb to realize they weren't just flying to another country, until it was too late. Also, you are not smart, like the author of this "joke".
Anonymous
._. this is a bit too plane