Flights grounded and travelers stranded — including at JFK and LaGuardia — after tech outage cripples banks and other companies around the globe

A failed tech update grounded flights, knocked banks offline and media outlets off the air across the world early Friday — with travelers at JFK and LaGuardia airports among those left stranded by the unprecedented and wide-scale internet disruption.

The global crisis was triggered when US cybersecurity company CrowdStrike deployed a faulty software update to computers running Microsoft Windows overnight, crashing them and leaving the ominous so-called “blue screen of death.”

“I don’t think it’s too early to call it: this will be the largest IT outage in history,” tech expert Troy Hunt, an Australian Microsoft regional manager, tweeted early in the chaos.