Aerospace and Defense - includes the operations of our wholly-owned subsidiary Aerojet Rocketdyne, Inc. ("Aerojet Rocketdyne"), a leading technology-based designer, developer and manufacturer of aerospace and defense products and systems for the United States ("U.S.") government, including the Department of Defense ("DoD"), the National Aeronautics and Space Administration ("NASA"), and major aerospace and defense prime contractors.
Real Estate - includes the activities of our wholly-owned subsidiary Easton Development Company, LLC ("Easton") related to the re-zoning, entitlement, sale, and leasing of our excess real estate assets. We currently are in the process of seeking zoning changes and other governmental approvals on our excess real estate assets to optimize their value.
The year of our subsidiary, Aerojet Rocketdyne, ends on the last Saturday in December. As a result of the 2016 calendar, Aerojet Rocketdyne had 53 weeks of operations in 2016 compared with 52 weeks of operations in 2018 and 2017. The additional week of operations, which occurred in the fourth quarter of 2016, accounted for $32.2 million in additional net sales.