A friend of mine (Mizzou official) just called. That plane is a Baron, and is reserved for faculty and administrators for "official business" only.
Now, it's important to remember that Deaton is the chairman of the Big 12 board, so this could be something pertaining to exit fees.
However, I highly doubt that exit fee info and documentation would be passed this way and it would make no sense for an OU official or plane to be involved in that process.
Bottom line? It could be nothing. But the timing and destinations do give us valid reasons to wonder what the heck is going on with that plane.