approximately US$25 million per unit. JF-17B Block 2 Dual-seat variant of the JF-17 Block 2. First flight in Chengdu, China on 27 April 2017. Serial production in China and Pakistan from 2018 to 2020. A total of 26 aircraft built - first four at Chengdu and remaining 22 at Kamra. Its multi-roles include use as a (i) JF-17 conversion trainer; (ii) Lead-In Fighter Trainer (LIFT); (iii) ground-attack aircraft; and (iv) reconnaissance aircraft. Apart from the dual-seat, larger dorsal spine, and a more swept-back tail, another difference between the JF-17B and the JF-17A is that the JF-17B carries fuel in its vertical stabilizer, which the JF-17A does not. The JF-17B houses integral fuel tanks like the F-16. Each wing houses 550 Ib while the vertical tail houses 210 lb, which, together with the internal fuel load, totals 4,910 Ib of fuel. Together with the three external fuel drop-tanks, the aircraft can carry a total 10,000 Ib fuel load. The JF-17B Block 2s will be retrofitted with the NRIET/CETC KLJ-7A Air-cooled Airborne Fire-Control Active Electronically Scanned Array (AESA) radar (license-manufactured at the Avionics Production Factory (APF) at PAC, Kamra). JF-17C Block 3 Single-seat variant of the JF-17 Block 3. First flight in Chengdu, China on 15 December 2019. Two prototypes underwent flight tests as of December 2020, one in China and the other in Pakistan. Went into serial production at PAC Kamra on 30 December 2020. Projected to feature further advancements such as a NRIET/CETC KLJ-7A Air-cooled Airborne Fire-Control Active Electronically Scanned Array (AESA) radar (license-manufactured at the Avionics Production Factory (APF) at PAC, Kamra), a three-axis digital fly-by-wire flight control system, an infrared search and track (IRST) system, a helmet-mounted display and sight (HMD/S) system produced jointly by Pakistan and China, a missile approach warning system (MAWS) similar to the one used on the Chinese J-10C, J-16, and J-20, a new, larger, and thinner holographic wide-angle head-up display (HUD) similar to the one used on the J-10C and J-20, an enhanced electronic warfare management system, a chin-mounted hardpoint, use of more composites for further weight reduction, Klimov RD-93MA afterburning turbofan will be eventually replaced by Guizhou WS-13 with an increased thrust, and a better thrust-to-weight ratio. The KLJ-7A can simultaneously track 15 targets and engage 4 targets. PAF officials have described the JF-17 Block 3 as a "fourth generation plus" fighter jet. The first PAC-produced JF-17 Block 3 aircraft are expected