Prior to that, in 2012, DARPA’s Autonomous High-Altitude Refueling program demonstrated fully autonomous aerial refueling of unmanned air vehicles at high altit

Prior to that, in 2012, DARPA’s Autonomous High-Altitude Refueling program demonstrated fully autonomous aerial refueling of unmanned air vehicles at high altitude. This culminated with two modified RQ-4 Global Hawkdrones flying in close formation to test probe-and-drogue contacts, as seen in this video: https://www.thedrive.com/the-war-zone/40955/the-navys-tanker-drone-makes-history-by-refueling-a-manned-aircraft-for-the-first-time https://www.thedrive.com/the-war-zone/40955/the-navys-tanker...