SKY SIMULATIONS proudly presents our Mc Donnell Douglas DC-9 Update to Version 3.1 for MSFS 2020 and 2024. VERSION 3.1 HIGHLIGHTS. •Flight dynamics adjustment and refinement. •Completely revamped Autopilot. •Fixed engine performance and spool up. •Fixed Internal and external animations. •Fixed Strobe lights and White aft navigation lights. •Fixed Fuel Management •Fixed Windshield wipers •Some textures have been fine-tuned and corrected. •Contrails and other effects. •Added windshield de-icing refined and now functional. •Many other details have been fine-tuned. •4 new liveries. •Swissair •Northwest Airlines •Pacific Southwest •AirTran