Lockheed Martin, Boeing, Airbus, and Northrop Grumman are the four largest Western aerospace manufacturers that make complete military aircraft, although France’s Dassault and the UK’s BAE Systems are also significant. According to CompaniesMarketCap, as of the time of writing, Boeing is the most valuable with a market capitalization of $197 billion, followed closely by Airbus at $193 billion, then Lockheed Martin at $134 billion, and Northrop Grumman at $96 billion.