I'd give an extra 20 minutes to processing time for 9/11 as in my experience things are a bit more "by the book" and intensified "professionalism". I've traveled on 9/11 3 out of the past 5 years to or fro NYC and have had 1 normal experience, 1 where things went slowly and 1 where I got into a verbal fight with an TSO that threatened to have me arrested because I defended a military cadet from his abuse and lies about TSA rules & regs. On all 3 occasions I was PreCheck.