Pakistan has been contemplating to acquire more used planes for the PAF from other countries while the induction of new production JF-17 Thunder continues. The JF-17 is a co-production of Pakistan and China. Through the upgrade process carried out at the US Air Force Ogden Air Logistics Centre, structural upgrades were performed to extend the aircraft life from the designed 4,000 to 8,000 hours flying time. Other modifications include changes to the engine bay, to receive the upgraded Pratt and Whitney F100-220E engine. Most of Pakistanâ€™s F-16s are of early generation A/B models, acquired from US surplus and upgraded through MLU. Some were delivered free of charge by the US Government. The new acquisition will bring the Pakistani Air Force F-16 fleet to 76. Only 20 are of more modern make, namely F-16C and F-16C/D Block 52. While Pakistan is seeking relative parity with India, the PAF currently has no counterpart for Indiaâ€™s Su-30MKI, nor the future Rafale, (when and if the MMRCA is to be fielded). Pakistan has been considering buying Chinese FC-20 (J10) fighter planes they considered could be a fair match to the Rafale. However, it is now considered that Thunder Block III and more upgrades to their F-16s, bringing the Falcons to the Block52 level could satisfy the PAF requirements for the near term. Pakistan and China are also working on a combat-capable, two-seat conversion trainer variant of the Thunder, which would meet Pakistan Air Force requirements for special missions and night attack, as well as improve export sales prospects for the aircraft. Further improvements are planned for the Block III, a version which is currently on paper, but could enter design phase in 2016.