We arrived yesterday on American at 2:15, parked close and walked to the terminal. It took 30 minutes to clear immigration and 30 minutes to get bags. A young couple in front of us were carrying only backpacks. They tried to skip the line when we first entered the outdoor shelter and were denied. However, they asked again when we entered the building and were allowed to go to the "transit" line. Like others have mentioned, I think it just depends on who is working the lines.