Lockheed Martin said 2019 revenue may climb even higher than it projected three months ago after sales of the F-35 fighter jet, the most expensive weapons program in U.S. history, topped $910 million.

Customer purchases of the fighter during the first three months of the year drove growth of 27 percent in aeronautics, Bethesda, Md.-based Lockheed’s biggest business, which posted sales of $5.58 billion, the company said Tuesday.