U.S. weapons maker Lockheed Martin Corp (LMT.N) is in the final stages of negotiating a deal worth more than US$37 billion to sell a record 440 F-35 fighter jets to a group of 11 nations including the United States two people familiar with the talks said. This would be the biggest deal yet for the stealthy F-35 jet as it is set to make its Paris Airshow debut this week. The sale represents a major shift in sales practices from annual purchases to more economic multi-year deals that lower the cost of each jet.

The pricing of the jets was still not final, though the average price of the 440 jets was expected to be $85 million, the people said on condition of anonymity because they were not authorized to discuss the negotiations publicly. The multi-year deal for the fighters will consist of three tranches over fiscal years 2018-2020.

A Lockheed representative said the company does not discuss negotiations on contracts and any deal involving a "block buy" would be announced by the U.S. government. A representative for the customers including the United States did not immediately respond to a request for comment on Sunday.