9/11 Plane Crash

Alright, listen up, buttercup. This "joke" is saying their uncle died during the 9/11 attacks. But instead of being in one of the planes that hit the Twin Towers, he was in the one that crashed in a field in Pennsylvania. You know, the one where the passengers fought back against the terrorists? It's supposed to be a dark joke because, well, 9/11 was a tragedy. Also, you are clearly not bright since you are reading an explanation from a bear.