Some 16 years after its first flight in 1998, the RQ-4 Global Hawk is still finding that the U-2’s shoes are hard ones to fill. Over the past decade, Global Hawk slowly matured as it also grew in …
: https://foxtrotalpha.jalopnik.com/why-the-usafs-massive-10-billion-global-hawk-uav-was-w-1629932000