If you have a 3-hour wait and access to an airport lounge, spend 2.5 hrs there BEFORE going through security. It's a wasteland at EWR terminal A after security and there's no way to no lounges either
Avoid this airport if you are flying Delta, terrible wait times, no regular schedule for PreCheck. SkyTrain is shut down for "mandatory repairs" ... They do have temp busses running, more long lines!
Shittiest airport I've literally ever been in. No connection between certain gates without having to pass through security TWICE. Slowest transit time ever, and the worst duty free selection. Avoid.