Boeing’s F-15EX jet makes its first flight The F-15EX makes its inaugural flight on Feb. 2, 2021. (Eric Shindelbower/Boeing) WASHINGTON — Boeing’s first F-15EX took to the skies for its inaugural flight on Feb. 2, a milestone that will allow the company to deliver the first two planes to the U.S. Air Force by the end of March. After a couple of hours of delays due to weather — which also held up plans to conduct a first flight on Feb. 1 — Boeing test pilot Matt “Phat” Giese took off from Lambert International Airport in St. Louis, Missouri, at approximately 1:57 p.m. EST.