Trump’s claim of an additional $600 million applies to the next block
of aircraft—a 90-plane order. Negotiations for Block 10 were already under way
before the election, and the projected price per aircraft was under
$100 million. The increased production rate would reduce Lockheed’s
costs, in theory. With the price already set to drop by at least $2
million per aircraft, another 4 percent off the lot’s price doesn’t seem
to be much of a stretch.

Lockheed executives had promised a price reduction for the F-35 following a tweet by Trump in December. Aside from the tweet, and Mattis’ ordered review, it’s not clear what sort of work Trump has done on the program since.

(via Trump says he’s “fixed” F-35 program after less than month in office | Ars Technica)