[jjotto]

Catches outside of the field of play are routinely ruled as outs. Why would you think otherwise?

[SamAdams76]

Because I've seen right fielders jump into the stands and the balls they caught were ruled as outs. I mean their entire body was in the stands and yet OUT! Yet I've never seen anybody leap into the bullpen to make a catch. I always wondered why.

Now what if a right fielder leaped into the bullpen and made the catch while still airborne (before landing on the bullpen ground)? Would that be an out?