Advanced jets like the F-35 have stealth coatings, unique materials and cutting-edge technologies that take more work to maintain, driving up costs.
The Sgt. STOUT and Avenger, both mobile air defense systems, deployed for major European and African exercises.
The Air Force said it is also preparing to award a contract to convert the Boeing 747-8 into a presidential transport plane.
Sen. Tammy Duckworth blasted the Qatari-gifted plane as a security risk and a waste of taxpayer money.
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