Question: The Pilatus PC-9 is a more powerful evolution of the plane that more than 20 air forces now use as their what?

Context paragraphs:
No. 2 Flying Training School RAAF: No. 2 Flying Training School (No. 2 FTS) is the main flying training school of the Royal Australian Air Force (RAAF).  Formed under its present name in 1969, it is located at RAAF Base Pearce, Western Australia.  The unit operates a fleet of Pilatus PC-9 turboprop trainers.  No. 2 FTS traces its origins to the post-war re-establishment of the Air Force's original cadet training unit, No. 1 Flying Training School (No. 1 FTS), at RAAF Point Cook, Victoria, in 1947.  Following reorganisation of aircrew training in 1951–52, No. 1 FTS was renamed No. 1 Applied Flying Training School (No. 1 AFTS), and began specialising in advanced flight instruction on CAC Wirraways.  It relocated to RAAF Base Pearce in 1958, where it converted to De Havilland Vampire jet trainers.  In January 1969, the school was reformed as No. 2 FTS, having the previous year begun replacing the Vampires with Macchi MB-326Hs.  The Macchis were themselves replaced by the PC-9 beginning in 1989.

No. 82 Wing RAAF: No. 82 Wing is the strike and reconnaissance wing of the Royal Australian Air Force (RAAF).  It is headquartered at RAAF Base Amberley, Queensland.  Coming under the control of Air Combat Group, the wing operates F/A-18F Super Hornet multirole fighters and Pilatus PC-9 forward air control aircraft.  Its units include Nos. 1 and 6 Squadrons, operating the Super Hornet, and No. 4 Squadron, operating the PC-9.

Continental Air Forces: Continental Air Forces (CAF) was a United States Army Air Forces major command at the end of World War II and during the early Cold War for combat training of bomber and fighter personnel and for Continental United States (CONUS) air defense after the Aircraft Warning Corps and Ground Observer Corps were placed in standby during 1944.  CAF conducted planning for the postwar United States general surveillance radar stations, and the planning to reorganize to a separate USAF was for CAF to become the USAF Air Defense Command (ADC was headquartered at CAF's Mitchel Field instead of the CAF HQ at Bolling Field.)  On 21 March 1946, CAF headquarters personnel and facilities at Bolling Field, along with 1 of the 4 CAF Air Forces (2nd—which had its HQ inactivated on 30 March ) became Strategic Air Command.  US Strategic Air Forces of WWII, e.g., Eighth Air Force and Fifteenth Air Force, transferred later to SAC.  Most of the CAF airfields that had not been distributed to other commands when SAC activated were subsequently transferred to Air Defense Command (to which CAF's 1st & 4th Air Forces were assigned on 21 March), Tactical Air Command (3rd Air Force), and Air Materiel Command from 23 March 1946 to 16 March 1947 before the USAF was activated in September 1947.

Pilatus PC-9: The Pilatus PC-9 is a single-engine, low-wing tandem-seat turboprop training aircraft manufactured by Pilatus Aircraft of Switzerland.  Designed as a more powerful evolution of the Pilatus PC-7, the PC-9's first flight was made in May 1984 after which certification was achieved in September 1985.  After this, the first production orders for the type were received from the Royal Saudi Air Force, with deliveries commencing in 1985.  Since then, more than 250 airframes have been produced across five different variants and the type is employed by a number of military and civilian operators around the world, including the Swiss Air Force, the Royal Australian Air Force, and the Royal Thai Air Force.

Blue Phoenix: Blue Phoenix are the first ever formed Royal Thai Air Force Aerobatic Team, which fly five blue, white and red painted Pilatus PC-9 aircraft, all fitted with white smoke generators.  The team is a part of Flying Training School RTAF Squadron based at Nakhon Pathom's Kamphaeng Saen Air Force Base, and so the pilots are instructors from the same squadron.  Blue Phoenix inheriting the aerobatic flying spirit from their former very own aerobatic team of the RTAF Flying School called “Sean Mueang” that was disbanded several decades ago.

Pilatus PC-7: The Pilatus PC-7 Turbo Trainer is a low-wing tandem-seat training aircraft, manufactured by Pilatus Aircraft of Switzerland.  The aircraft is capable of all basic training functions including aerobatics, instrument, tactical and night flying.  It has been selected by more than 20 air forces as their ab initio trainer.  Since the aircraft's introduction in 1978, close to 500 have been sold, with the majority still in service.  Over one million hours have been flown by PC-7s worldwide.

Central Flying School RAAF: Central Flying School (CFS) is a Royal Australian Air Force (RAAF) training unit, located at RAAF Base East Sale, Victoria.  It operates the Pilatus PC-9 turboprop trainer.  The school is responsible for training flight instructors, setting flying standards, and auditing flying practices.  It is also home to the "Roulettes" aerobatic team.  CFS was the first military aviation unit to be formed in Australia, in 1913, when its role was to provide basic flying training.  Its current form dates from World War II, when it was re-established to train flying instructors for the Empire Air Training Scheme (EATS).

Soviet Air Forces: The Soviet Air Forces (Russian: Военно-воздушные силы , "Voyenno-Vozdushnye Sily" (VVS), literally "Military Air Forces") was the official designation of one of the air forces of the Soviet Union.  The other was the Soviet Air Defence Forces.  The Air Forces were formed from components of the Imperial Russian Air Service in 1917, and faced their greatest test during World War II.  The groups were also involved in the Korean War, and dissolved along with the Soviet Union itself in 1991–92.  Former Soviet Air Forces' assets were subsequently divided into several air forces of former Soviet republics, including the new Russian Air Force.  "March of the Pilots" was its anthem.

Beechcraft T-6 Texan II: The Beechcraft T-6 Texan II is a single-engine turboprop aircraft built by the Raytheon Aircraft Company (which became Hawker Beechcraft and later Beechcraft Defense Company, and was bought by Textron Aviation in 2014).  A trainer aircraft based on the Pilatus PC-9, the T-6 has replaced the Air Force's Cessna T-37B Tweet and the Navy's T-34C Turbo Mentor.  The T-6A is used by the United States Air Force for basic pilot training and Combat Systems Officer (CSO) training and by the United States Navy and United States Marine Corps for primary Naval Aviator training as well as primary and intermediate Naval Flight Officer (NFO) training.  The T-6A is also used as a basic trainer by the Royal Canadian Air Force (CT-156 Harvard II), the Greek Air Force, the Israeli Air Force ("Efroni"), and the Iraqi Air Force.  The T-6B is the primary trainer for U.S. student naval aviators.  The T-6C is used for training by the Mexican Air Force, Royal Air Force, Royal Moroccan Air Force, and the Royal New Zealand Air Force.

Zielflugstaffel 12: Zielflugstaffel 12 (No 12 Target squadron), former known as Fliegerstaffel 12 of the Swiss Air Force is a militia squadron equipped with Northrop F-5E and Pilatus PC-9 and part of the Flugplatzkommando 7.  The home base of the unit is Militärflugplatz Emmen.  As coat of arms, the Zielflugstaffel carries a badge with a yellow and black target pattern, a bullseye and the writing “ Zfl St 12”.

Supporting paragraphs: Pilatus PC-9 Pilatus PC-7
Answer: ab initio trainer