The flight school where I work at had this same idea about the older KingAir. We already have an E-90. Picked up an old '67 A-90. Nice airplane. However, the Chinese airline that is sponsoring all of our Chinese students made us quit using the older KingAir. They require their students to fly turbine equipment that met a certain weight. The old KingAir did not meet that weight, so we ended up getting rid of it. Food for thought unless you only fly domestic students.