Timeline: How the CrowdStrike outage unfolded

A global software outage Friday brought many computer systems across business, healthcare, technology and government sectors to a screeching halt in under 12 hours.

A global software outage Friday brought many computer systems across business, healthcare, technology and government sectors to a screeching halt in under 12 hours. How did the crash unfold? Which systems have recovered, and which ones are still affected? We break it down. (All times Eastern Time.) Overnight on Thursday and into Friday, several states, including Alaska and Arizona, experience 911 service outages. Some hospitals also begin experiencing technology issues overnight, according to nurses on shift. Between 2 and 3 a.m., the Federal Aviation Administration announces that all Delta and American Airlines flights are grounded. Several minutes later, the FAA says flights from United and Allegiant Airlines have been grounded regardless of their destination. Spirit Airlines says its flight reservation system has also been affected by the outage. A few hours later, between 5 and 6 a.m., public transit systems in the Northeast begin announcing that they have been impacted. Washington, DC, public transportation services — including trains and buses — begin experiencing delays, according to the Washington Metropolitan Area Transit Authority.