expected to be license produced in Taiwan with a local partner firm, and the overall estimated contract value is 69 billion New Taiwan dollars (US$2.2 billion). However, Taiwan decided to build 66 AIDC T-5 Brave Eagle supersonic trainers based on Taiwan's existing AIDC F-CK-1 Ching-kuo fighters for NT$68.6 billion instead of selecting the T-50 or M-346. United States: The T-50A was one of the contenders for the U.S. Air Force's T-X program, with an opportunity to export 300 to 1,000 aircraft. In September 2018 the U.S. Air Force selected Boeing's T-7 trainer. In January 2020, the U.S. Air Force posted a notice stating that it would lease four to eight T-50A trainers from Hillwood Aviation due to delays in manufacturing the T-7A. In August 2020 the acquisition was delayed due to the COVID-19 pandemic; in October it was announced that the plan had been further delayed . Uzbekistan: In October 2015, the U.S. refused to approve the sale of the KAI T-50 advance trainer to Uzbekistan. The T-50 uses a US-made engine, the F404, which requires a US export license to re-export to another country along the T-50. However, due to political considerations related to Uzbekistan, the US refused to approve this. Variants T-50: Advanced trainer version. T-50B: Aerobatic-specialized T-50 version. Currently used by ROKAF's aerobatic display team, the Black Eagles. TA-50: Lead-in fighter trainer and light attack version. F/A-50: Light fighter/attack version, originally named A-50. A prototype from a converted T-50 first flew in 2011. Block 10: Software upgrades to enable integration of Lockheed Martin AN/AAQ-33 Sniper targeting pod Block 20: Integration of telescopic probe solution from Cobham Mission Systems for inflight refueling capability, conformal 300 gallon fuel tank for better range, integration of mid-range air-to-surface missiles and beyond-visual-range air-to-air missiles (BVRAAMs), avionics upgrade and possible AESA radar F-50: A proposed single–seat multirole fighter variant that was cancelled in favor of the KAI KF-21. Country-specific versions T-50i: Version of the T-50 for Indonesian Air Force. T-50IQ: Version of the FA-50 for Iraqi Air Force. F/A-50PH: Version of the FA-50 for the Philippine Air Force F/A-50PL: Version of the FA-50 for the Polish Air Force. T-50TH: Version of the T-50 for Royal Thai Air Force. with some FA-50/TA-50 equipment and capability such as EL/M-2032 radar, MIL-STD-1760 interface, 20 mm gun, Radar warning receiver, Countermeasures Dispenser System. Compatible to Laser-guided bomb, AIM-9 Sidewinder and AGM-65 Maverick missile, integration for Beyond-visual-range missile