Aviation Assistance GmbH - Worldwide distributor of aviation parts and services specializing in business jets and turbine aircraft, corporate aircraft sales, brokerage and consulting. AirNav Systems - Aircraft tracking software. 7jetset7 - Provides up-to-date airline/operator information for aviation technical personnel and jet airplane enthusiasts around the world. Tulsair Beechcraft, Inc. - New and used airplanes for sale, aircraft parts and service, engine maintenance, fueling, jet and turboprop charter, aircraft leasing and storage. Alta Flights - Canadian firm specializing in aircraft charters, sales and maintenance. Aircraft Value Analysis Company - Provides current and future market values for aircraft above 19 seats. Also publishes The Aircraft Value Reference, a guide to future values and lease rates.