The F-35 jet fighter helped the U.S. achieve both military air superiority and billions in trade for years. But President Trump’s recent rhetoric has forced some American allies to reconsider their reliance on the aircraft and eye European alternatives like the U.K. and EU’s Eurofighter, France’s Rafale and Sweden’s Gripen. WSJ explores how one of the world’s most expensive weapons is at risk of losing its dominance. Chapters: 0:00 The F-35 program 0:37 What buying an F-35 means 1:02 Trump’s