HB-OKP Piper L-4J Grasshopper Private Ecuvillens (LSGE), Switzerland Andy Davey - 28/06/2008
HB-OKP Piper L-4J Grasshopper Private Bern Belp (BRN / LSZB), Switzerland Ken Elliott - 13/10/1968
HB-OKP Piper L-4J Grasshopper Private Zurich (ZRH / LSZH), Switzerland Juha Ritaranta - 11/07/2006
HB-OKP Piper L-4J Grasshopper Private Triengen (LSPN), Switzerland Ken Tilley - 14/09/2006
