I wouldn't expect emergency rooms and 911 to stop working either, but here we are, so until someone says otherwise, I'm assuming some ATCs went down too.

I imagine the flight planning software they use was affected (so their ability to coordinate with other airport's ATC), but not their radio systems or aircraft radar (nearly all radar systems I've worked with are run on Linux, and are hardened to the Nth degree). Been out of the game for 12 years though, so things have likely changed.