Pratt criticizes Lockheed's advocacy for adaptive engine technology.

Lockheed Martin's advocacy for the Adaptive Engine Transition Program (AETP) as an alternative engine for the F-35 has caused tensions with engine producer Pratt & Whitney, who feel betrayed by the public comments. Pratt executives accused Lockheed of attempting to delay or stop the Air Force's Next Generation Air Dominance program and seeking greater longevity on the F-35 line that would distract from or defeat the purpose of a new, sixth-generation fighter. The disagreement centers around the future of the engine and the need for a sixth-generation fighter.