The Super King Air family, produced by the Beech Aircraft Corporation, has been in continuous production since 1974.

In 1990, Beechcraft introduced the Super King Air 350 and was initially marketed and it was previously designated as Model B300 and later in 1996, it was reduced to King Air 350. The 200 series was proven to be popular that Beechcraft began working on a successor, the Model 300/350 Super King Air. The prototype Model 300's maiden flight was on September 3, 1983 and deliveries started the following year. In 1998, Beechcraft began working on the Model B300, the replacement for the 300 and other variants such as the Model B300C. It was also marketed as the Super King Air 350C and the first deliveries of the model took place in 1990.

The Model 300 has an increased MTOW of 14,000 lb. The Model B300 has two extra cabin windows each side of forward fuselage and winglets on wingtips and there are about 570 Model B300 built as of December 2007. The Model B300C, a version of B300 with cargo door and there are 19 built as of December 2007.

King Air line have almost 6,500 aircrafts delivered and are operated by corporate, commercial, military and special mission operations in more than 94 countries. Almost half of the aircraft delivered came from the 200/300 series family.