"There are at least two Global Hawks in the air at all times providing indispensable ISR information to those that need it. The 2014 fiscal year was the most active yet for the Global Hawk, with a 40 percent year over year increase in flight hours."
Source: Mick Jaggers, Global Hawk UAS program director, Northrop Grumman Aerospace Systems, as the U.S. Air Force RQ-4 Global Hawk and other variants of Northrop Grumman Corporation's High Altitude Long Endurance (HALE) Unmanned Aircraft System (UAS) series continued to prove their value to U.S. government agencies by flying more intelligence, surveillance and reconnaissance (ISR) mission hours in one week than ever before.