Alaska Airlines temporarily grounded its fleet late Sunday. It’s a reminder of the threat posed to the sector by tech outages.

A small airport in Alaska came to a screeching halt when an Alaska Airlines passenger jet struck at least two deer crossing the runway at the wrong time. The incident unfolded Thursday morning at around 8 a.

Alaska Airlines flights were back late Sunday night after an IT outage forced the company to ground all flights for three hours. From 8 p.m. until 11 p.m. PST, Alaska Airlines planes were on hold. The airline did not reveal the nature of the outage.