In what has become a recurring theme of 2017, a key piece of Atlanta broke down in spectacular fashion on Sunday.

A fire, possibly caused by an equipment failure Sunday afternoon, caused an hours-long black out at the airport, the Atlanta Journal Constitution reported. Because Atlanta’s airport is the busiest in the world, the power outage caused hundreds of flight cancellations, according to NBC news. That could potentially have ripple effects throughout the busy holiday travel week ahead as passengers reschedule their flights.

The AJC published an FAQ for passengers. To read it, click here.

The outage left passengers stuck on planes for hours and created some unusual scenes Sunday.

Dealing with the power outage at the Atlanta airport was actually insane and I’ll post other scary videos later. But the staff was having to slide down the escalators to help people and it was amusing. Finally in the car headed home. #atlantaairport #atl #atlanta

A post shared by sarahmanleyy (@sarahmanleyy) on Dec 17, 2017 at 2:54pm PST

Getting off the plane at the ATL airport during the power outage- it was soooky surreal 🙏🏾✨#sandiego #atlanltaairportpoweroutage #atlanta

A post shared by Steven Jones (@drstevenjones) on Dec 17, 2017 at 6:30pm PST

Georgia Power released the following statement on the failure. Many have asked why the redundant systems didn’t kick in to keep the airport running after the fire. GA power said the fire affected several substations serving the airport. The exact cause of the fire isn’t known.