The Model 200 and Model 300 series were originally marketed as the "Super King Air" family; the "Super" designation was dropped in 1996. They form the King Air line together with the King Air Model 90 and 100 series. Beechcraft currently offers the 250 (design. B200GT) and the larger 350i (B300) models. The 350ER (B300CER) is available to government, military and commercial customers for special mission operations such as aerial survey, air ambulance, flight inspection and surveillance. The Beechcraft 1900 regional airliner was derived from the Model B200 King Air. The Model 200 was originally conceived as the Model 101 in 1969, and was a development of the Model 100 King Air. The Model 200 had essentially the same fuselage as the Model 100, with changes to the rear fuselage to accommodate a new T-tail (in place of the 100's conventional tail with all-moving trimmable horizontal stabilizer) and structural changes to allow higher maximum pressurization. Apart from the T-tail, other changes included Pratt & Whitney Canada PT6A-41 engines rated at 850 shp (630 kW) instead of the 680 shp (510 kW) engines of the Model A100 then in production, and a wing of increased span and extra fuel capacity. Overall, the 200 was 3 ft 10 in (1.17 m) longer than the A100, with wingspan 4 ft 3 in (1.29 m) greater, containing 60 US gallons (230 L) more fuel. Maximum Take-Off Weight (MTOW) was increased by 1,000 lb (450 kg). For more etails on the 200 and 300 series King Airs, click here. Specifications below are for the King Air 250 variant.