Shmitke Air, Inc.) of the Subject Aircraft (as hereinafter defined), For purposes of this agreement the "Subjett Aircraft' shall mean that certain Sikorsky 3-76 C++ Helicopter, Serial No. 760667 (116671,' that certain Sikorsky 5.76 C++ Helicopter, Serial No. 760750 r750I, and that Sikorsky S-76C+ Helicopter