PMDG has created nine aircraft for Flight Simulator 2004 and ten aircraft for Flight Simulator X, two of which are extensions of the 747-400X. The PMDG Boeing 737 NGX is for Flight Simulator X and Prepar3d only and is currently available in 737-800/900 winglet/non-winglet models. The 737-600/700 winglet/non-winglet models are a continuation of the base package and are available as an expansion. The 777-200LR and accompanying 777-300ER expansion were the first PMDG products for Lockheed Martin's Prepar3D V2 which was released on February 7, 2015, as well as Flight Simulator X (the NGX was patched to P3D V2 compatibility after the 777). These two products are widely regarded as some of the best offerings for flight simulation in terms of system depth, fidelity, and function, as well as faithful exterior modelling, sound, and flight dynamics.