**F-35 Lightning II: The Stealth Fighter at the Heart of Western Air Power** The F-35 Lightning II, Lockheed Martin's fifth-generation stealth fighter, is the connective tissue of allied airpower—flown by the US and more than a dozen partners, its radar-evading silhouette and sensor fusion define what aerial dominance looks like in the 21st century. Recent signals place the program at a crossroads. The US Air Force told Congress it needs 1,509 combat-ready fighters by 2035, and while Lt. Gen. David Tabor confirmed the service is weighing a new-build F-16, he called that decision not "urgent"—a quiet vote of confidence in the F-35 as the fleet's backbone. The loss of an F-15E over Iran, meanwhile, is a sobering reminder that combat attrition can drain jet inventories faster than production lines refill them. Abroad, Italy's pivot to Airbus tankers and Canada's Saab GlobalEye purchase reveal allies hedging toward European suppliers—a current that could temper F-35 export momentum even as NATO interoperability keeps the jet indispensable. For investors and defense watchers, the actionable signals are clear: track procurement budgets, Fort Worth production rates, and foreign military sales. Each contract signed—or diverted—ripples through supply chains, alliances, and the future balance of airpower.