
The Texan II is named after the World War II-era North American Aviation AT-6 Texan, which was the advanced trainer used by the United States military from 1940 to 1955. The T-6A is used as a primary trainer by both the U.S. Air Force and the U.S. Navy.
The Texan II is a two-place, single engine low-wing monoplane with retractable tricycle landing gear. It is 33 feet, 4 inches (10.160 meters) long with a wingspan of 33 feet, 5 inches (10.185 meters) and height of 10 feet, 8 inches (3.251 meters). It has an empty weight of 4,707 pounds (2,135 kilograms), gross weight of 6,300 pounds (2,858 kilograms) and maximum takeoff weight of 6,500 pounds (2,948 kilograms).
The Texan II has a cruise speed of 320 miles per hour (515 kilometers per hour), service ceiling of 31,000 feet (9,449 meters) and range of 1,036 miles (1,667 kilometers).

© 2017, Bryan R. Swopes
Minor comment: calling the T-6A a militarized version of the Pilates PC-9 is a bit inaccurate. In essence, in order to meet the requirements of the Joint Primary Aircraft Training System (JPATS) contract, the airplane was essentially completely redesigned. In the end, only a basic resemblance to the PC-9 remained.
The Pilatus PC-9 is primarily a military training aircraft by design (it has no other target market and has sold in large numbers to numerous military training organisations around the world). Changes were made by Beechcraft to align the original Pilatus design with the requirements of JPATS but I think the main layout, structure and aerodynamics are per the original PC-9.
Remember the days when we could come up with good names for things rather than “II” or another duplicate name with added with numbers at the end?