Diamond's aggressive new D-Jet program has been aimed primarily at the burgeoning owner-pilot market -- with the hopes that a simple and capable single-engine jet might be more palatable to the upgrading piston and light turbine pilot than the supposedly more complex Eclipse 500 and the Cessna Citation Mustang. With an altitude limit of 25,000 feet, it is Diamond's hope that the aircraft will prove to be safer if the pressurization goes tango-uniform -- and of course, being a single, they expect that in jet-terms, the D-Jet will be a bargain to operate.