The King Air series is a family of twin-engine turboprop aircraft produced by Beechcraft Corporation. Here are the descriptions for the King Air 90, 100, 200, and 300:

King Air 90: The King Air 90 is a popular business aircraft that is designed for short to medium-range flights. It has a maximum range of 1,240 nm and can seat up to 7 passengers depending on actual configuration. Even this King Air, being the smallest in its family, is equipped with a belted lavatory seat.

King Air 100: The King Air 100 is an upgraded version of the King Air 90, with a longer cabin and a more powerful engine. It has a maximum range of 1,265 nm and can seat up to eight passengers. The King Air 100 has a cruise speed of 280 knots and is powered by two Pratt & Whitney PT6A-28 turboprop engines.

King Air 200: The King Air 200 is a popular business aircraft that is designed for short to medium-range flights. It has a maximum range of 1,620 nm and can seat up to 9 passengers. The King Air 200 has a cruise speed of 280 knots and is powered by two Pratt & Whitney PT6A-42 turboprop engines.

King Air 300/350: The King Air 300 is a larger and more powerful version of the King Air 200, with a longer cabin and a higher cruise speed. It has a maximum range of 1,940 nm and can seat up to ten passengers. The Super King Air 300 can be configured in a variety of seating arrangements, but is commonly configured for 8 passengers in a combination of a club and individual or divan seating. The lavatory is located aft of the main seating, and a large baggage compartment occupies the aft cabin.