<prompt> Gadzira shanduro yakaoma zvikuru yemutsara uyu Pakutanga yakatanga seSierra Flight Systems.  <response>: Chokwadika, shanduro yakaoma zvikuru yemutsara wacho ndeiyi Pakutanga yakatanga seSierra Flight Systems, kambani yakabatanidzwa naGordon Pratt naRick Price muna 1997. 