Two independent projects working on RVSM group certification packages for the Learjet 20 series appear to be neck and neck in terms of price and availability. Avcon Industries of Newton, Kan., along with its partner Bizjet International in Tulsa, Okla., and Wichita-based LJSC and its partner Wichita Executive Aircraft, are saying they will have RVSM-compliant systems certified in June for less than $150,000 per aircraft.