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2. Boeing (BA)

Contracted in 2011: $21.45 billion
Total 2011 revenue: $68.73 billion
Contracted in 2012, so far: $16.03 billion
Company Profile
Although Boeing’s main sources of revenue are commercial airlines, the Chicago-based company’s Defense, Space & Security segment deals primarily with the U.S. government. That segment accounts for approximately $21 billion of the company’s $68 billion in 2011 revenue.

Boeing’s largest contracts in 2011 were for fixed-wing aircraft and airframe structural components. Its top five contracts were worth over $500 million each and the highest individual contract came in at $1.5 billion. Aside from traditional aircraft, Boeing was also contracted for over $1 billion by NASA, according to USASpending.gov.

Pictured: A Boeing-made United States Navy F/A-18F Super Hornet takes off from Nellis Air Force Base in Nevada.

Photo: Getty Images