People tend to check in during these times:
Long long long lines
Get ready for a walk
If the line is all the way to the end of the ropes figure 60-70 min through that then 45 min thru security .. if you might be late. Try to rebook for a potential escort thru
Have a good book at the new terminal customs is crazy
Claim your bag. It doesn't automatically go to your next flight!
NO CELL PHONES!
Global entry pass!
See the documentary film, "Please Remove Your Shoes" about the illusion of security.
Better to get a global entry pass