according to that airfleets.net site, 810LR is serial #3, acquired from a canuck airline. 906HA is #9 and the first that henson got. The only reason I knew about this was because there was an an article or post about how 810LR was supposed to go up on a pole at some aviation museum until Ornstein bought it... Check the placard by the pax door, I've never thought to actually check 906.... it certainly looks like the oldest!!!