ABC World News Tonight

A major outage is causing widespread flight disruptions, according to ABC World News Tonight with David Muir's September 21, 2026 broadcast. The news segment is trending on YouTube as viewers look for updates on delays and cancellations. The posts do not specify which system failed, which airlines or airports were affected, or how long the disruption is expected to last, so the scope and cause of the outage cannot be confirmed from the available evidence.