The Pentagon and Lockheed Martin Corp. have agreed on an $11.5 billion contract for the production and delivery of 141 F-35 fighters. The figure represents an overall reduction in cost of 5.4 percent per airplane. The price tag on the F-35 has dropped for 11 consecutive years, according to Lockheed. The F-35 program has been beset with cost and maintenance issues since its inception. A recent Popular Mechanics magazine article alluded to numerous reports about corrosion, for example. Still, the consensus is that the steady reduction in price – attributed to the gradual transition to full production from the prototype stage – is a good sign, the magazine reported.