Two big defense contractors landed contracts totaling nearly $180 million, both focused on enhancing fighter jets. Chicago-based The Boeing Co. (NYSE: BA) won a $152.4 million contract from the U.S. Navy on Aug. 16 to design, develop, integrate and test the Infrared Search and Track System (IRST) Block II. The Block II system will replace the IRST Block I. The IRST is used on Boeing's F/A-18E/F, or Super Hornet fighter jet — a military-grade aircraft that can travel at more than 1,100 mph. Nearly 90 percent of the work for the three-year contract will take place in Orlando, with the rest happening in St. Louis, according to the U.S. Department of Defense.