Airlines, banks, TV channels, and other businesses across the globe were scrambling on Friday to deal with one of the biggest IT crashes in recent years, caused by an update to an antivirus program. Chaos ensued as the cyber security company’s IT failure forced some live news outlets to go off air and financial markets to be in limbo. Aviation officials in the United States briefly grounded all planes, while airlines elsewhere cancelled or delayed flights, as systems running Microsoft Windows crashed. Microsoft said the issue began at 7pm GMT on Thursday, affecting users of its Azure cloud pla…