Pentagon officials argue that Lockheed was late in providing some of that data, and has held out on providing the level of detail government officials require.

Most of the issues have been resolved, but the two sides are still at odds over a little more than $100 million in costs.

Under pressure from government negotiators and shareholders, Lockheed last year reluctantly accepted terms it considered too ambitious for the fourth batch of jets, but it is resisting such terms this time around, worried that the government cost goals simply cannot be achieved and it will be left with a deficit.