According to the DALPA forum, a couple of the guys are Former NWA.
Why were they at National instead of at Delta?
I recall hearing a story about a tranquilized, unrestrained lion/tiger/whatever being transported in a Caravan, waking up during the flight and walking around. It was a successful outcome, but if you were the pilot you'd be weighing the odds of losing control while fighting the lion, or being eaten while diving for the ground, all while trying to keep him in the CG envelope.