Transport providers, businesses and governments are rushing to get all their systems back online after long disruptions following a widespread technology outage. The biggest continuing effect has been on air travel. Carriers canceled thousands of flights and now have many of their planes and crews in the wrong place, while airports are facing continued problems with checking in and security on Saturday. At the heart of the massive disruption is CrowdStrike, a cybersecurity firm that provides software to scores of companies worldwide. The company says the problem occurred when it deployed a faulty update to computers running Microsoft Windows, noting that the issue behind the outage was not a security incident or cyberattack.