Dragoons jump

[Viladin]

then what is the part about them not invoking attacks of opportunity referencing?

"A dragoon using this ability does not provoke an attack of opportunity unless they pass through a square that is threatened by a flying creature that he is not attacking directly. If a dragoon is hit in this manner, they fall to the ground prone in the square in front of the creature."

I'm not trying to be frustrating its just no one at my table understands how this works.

My bad. I was thinking about something else entirely. You are right, while jumping, they are immune to AoOs unless its by a flying creature's threatened space.