The T-50B is the acrobatic version of the South Korean designed and manufactured T-50. There is also the TA-50, which is the combat version. The T-50 was developed over the last decade, at a cost of over two billion dollars. The first test flight of the T-50 took place in 2002. The 13 ton aircraft is actually a light fighter and can fly at supersonic speeds. With some added equipment (radars and fire control) the T-50 becomes the TA-50, a combat aircraft. This version carries a 20mm auto-cannon and up to 4.5 tons of smart bombs and missiles. The T-50 can stay in the air about four hours per sortie and has a service life of 8,000 flight hours. South Korea has several export customers for the T-50 as well as orders from the South Korean air force.