Here's what SFO looked like with flights grounded amid global IT outage

SAN FRANCISCO (KGO) — A crippling cybersecurity outage brought down computer networks globally, including at San Francisco International Airport, where dozens of flights have been canceled or delayed.

This has left many passengers waiting around for their next step.

MORE: CrowdStrike says widespread disruptions were not the result of security incident or cyberattack

According to Flight Aware, they had 33 delays and more than 50 cancellations by 3:30 a.m.

Flight information display screens were down and frustrated passengers were seen waiting around, unable to even check a bag.

As of about 4:30 a.m., more than 540 flights across the country had been cancelled. The FAA said United, American, Delta, and Allegiant airlines had all been grounded.

ABC7 News talked to one passenger who was supposed to be leaving for a trip to Belize with a layover in Houston, when he wasn’t even able to check his bag.

“Pretty much just stuck here until we figure out what’s next,” he said. “Don’t know how long it’s going to be, it’s been at least a couple of hours that we have been waiting. We will see what’s next, I don’t know. Yeah, I’m stuck for a while.”

MORE: What is CrowdStrike, the company linked to the global outage?

American Airlines said they are back up and running as normal. Other airlines haven’t been so lucky.

United said they are only resuming “some flights” and expect more disruptions throughout the day.

Both Delta and also United said they are working to issue travel waivers to help passengers to change their travel plans.

Friday is a day travelers will absolutely want to check their flight status before leaving for the airport.