As a person thats travels 80% of the time, I can tell you a couple of things, some are common knowledge or sense:
1: Most airline in the US require check in 30min or more before departure. (Mostly because of baggage movements, I think)
2: Check in online 24hrs ahead of time.
3: Pay for baggage online and save time and money.
4: Know ahead of time that you WILL have to take your shoes, belt, hat, hoodie, and coat off prior to screening. (So dress light)
5: Laptops must come out of any unapprove TSA case.
6: Check your liquids.
7: Know the difference between "boarding time" and "departure times".
8: Check any baggage that you do not require on the plane.
9. Mondays and Fridays between 6am-9am are perk times for airports.
10. Do not tick off the lady behind the counter.
Most of these tips have save my 30-45min for any air travel of the course of the year.