Last year the UK ATC system crashed when it "encountered an extremely rare set of circumstances presented by a flight plan that included two identically named,

Last year the UK ATC system crashed when it "encountered an extremely rare set of circumstances presented by a flight plan that included two identically named, but separate waypoint markers outside of UK airspace". https://www.nats.aero/news/nats-report-into-air-traffic-control-incident-details-root-cause-and-solution-implemented/ https://www.nats.aero/news/nats-report-into-air-traffic-cont...