What's on the paper plane?

[Jennay]

I chose not to knock the plane out of the rafters but I'm curious what was on it. A note, a drawing, nothing?

[Solidus's Revenge]

You may have already moved on with your life, but I just played that part yesterday and, as far as I can tell, it has nothing on it. Knocking it down just causes Tyler to make a joke about what's written on it. I guess it's supposed to be an insult he made to Aly as a kid. It's actually not super clear from the brief dialogue about it in the game. When you walk over to it after it's on the ground, the game doesn't let you look at it or interact with it in any way. At least it didn't for me.

Anyway, you didn't miss anything.