Categories Articles The F-22 that took down China’s surveillance balloon used the call sign ‘FRANK01’ in an apparent homage to a heroic pilot from WWI Post author By crystalg Post date February 4, 2023 Business Insider Business Insider Tags 'FRANK01', apparent, balloon, call, China's, Down, from, Heroic, homage, Pilot, sign, surveillance, Took, used ← We’re Saying Happy Valentine’s Day with a MacBook Pro Discount → Spoiled rotten: Shopping with the kids adds nearly $50 extra in expenses