Forget my post above ^.
I finally got the serial communication to work with X-Plane 10 real time. The problem I have now is my X-plane 10 seems to get very slow after a certain amount of time and I think this is the case because it is storing too many data? (I can be wrong). What I did was I change my baud rate to the highest which help me keep X-Plane running but eventually the X-Plane 10 freezes again. I also tried changing my delay at which I am spitting information to the Arduino. This help X-Plane run a little long but eventually it freezes again.
Does this have something to do with my Arduino not being cleared? Does it have something to do with sending data to the Arduino but it is not being cleared?
Another question is, can Arduino slow down a computer in this type of situation?