The startup aviation company XTI Aircraft announced this week that it has been developing the XTI TriFan 600 concept, the world’s smallest fixed-wing aircraft capable of vertical takeoff and landing (VTOL), and is in the process of seeking funding to finance the first example. (A larger VTOL, the  AgustaWestland AW609 TiltRotor, from the helicopter manufacturer AgustaWestlands, is scheduled for delivery in 2017.) The six-seat, fixed-wing TriFan 600 will pair the speed, distance, and altitude capabilities …