Next time you are standing in line ready to go through security at the airport, take a look ahead of you.
Look at the agents using the screening machines. Are they fast or slow?
Look at how many babies or wheelchairs are in lines. Usually these take longer.
Check out how many bags the travelers in front of you have. Each bag needs to be placed on the belt, screened, and removed.
Look at people that seem confused by the whole process. You definitely don’t want to be behind them.