Pratt & Whiteney’s F135 engine for F-35 fighters: US based aircraft engine manufacturer Pratt & Whitney, Monday announced that the company has been awarded a $5.2 billion contract to support production of the 15th and 16th lots of F135 engines, with an option to award a 17th Lot, powering all three variants of the F-35 Lightning II fighter aircraft. The Lots 15-17 production contract funds production of 278 F135 engines with an option to order up to a total of 518 engines.