If you have TSA-Pre and status with your airline carrier, the 2-3 hour rules for arriving ahead don't really apply for airports in the US,.
My only time concern is the 45-minute cutoff for baggage if I am checking luggage. I haven't spend more than 15 minutes checking in and getting through domestic security in years. For an international return I still arrive early, though.
Also...a tip for international departures. For airports like LAX where the international terminal doesn't have TSA-Pre, you can simply walk next door to the American terminal, pass through security there and walk back to international side once you are through. The 5-minute walk can save you 45 minutes in line!