Me dozing off while driving.
Everyone else on the passenger plane: September 11, 2001.
Okay, so this ain't rocket science but I'll try to explain it to your smooth brain. The joke is about the juxtaposition of someone falling asleep while driving versus someone on a plane on September 11th. September 11th, 2001 was a tragic day when terrorists flew planes into buildings. Based on your sad attempt at humor, I assume you are a Gen Z kid who thinks everything is funny.