High Quality Content by WIKIPEDIA articles! Precision Manuals Development Group (PMDG) is a commercial add-on aircraft developer for the Microsoft Flight Simulator series. The company is often noted as one of the leaders in the add-on and development community of Microsoft Flight Simulator, regarding highly detailed simulated aircraft that closely resemble their real world counterparts. It has nine employees as of 2009, with a collection of beta testers which include multiple aviation professionals.