(Editor's Note: This story has been updated to correct information provided by the F-35 joint program office about the Block 4 time line. The $10.5 billion cost estimate is for a seven-year time period.) The F-35 joint program office estimates its Block 4 plan will cost $10.5 billion over seven years, plus an additional $2.8 billion to modify 441 jets to the new configuration. The Defense Department's fiscal year 2020 budget lays out the details of that plan and,...
