A Lockheed Martin F-35 Lightning II stealth jet fighter on the tarmac at Luke Air Force Base in Arizona. Turkey's purchase of 100 of the advanced aircraft is at risk because the NATO member also intends to buy a Russian anti-aircraft missile defense system.
A Marine Fighter Attack Squadron 121 F-35B Lightning II prepares to make a vertical landing in Yuma, Ariz., in 2013. President-elect Donald Trump asked Boeing to price a version of one of its fighter jets to be competitive with Lockheed Martin's F-35 aircraft.
Cpl. Ken Kalemkarian/U.S. Marines
An F-35 fighter jet arrives in Israel, one of the U.S. allies to put in orders for the next-generation aircraft. President-elect Donald Trump tweeted the program's $1 trillion price tag is "out of control."