Aviation News – Pratt & Whitney has received a $1.6 billion contract to sustain F135 engines that power all three variants of the F-35 Lightning II, underscoring the engine’s critical role in global defense operations. The undefinitized contract action, awarded to the RTX-owned manufacturer, covers a broad range of sustainment services for U.S. and international operators. These include depot-level maintenance and repair, spare parts replenishment, material management, propulsion system integration, engineering support, and software sustainment for the F-35 fleet.