This is a hidden gem and I shouldn't be spreading the word! Traveling with my wife and two kids on a Saturday, we used the curbside drop off at the 44th st and Washington station. There was not another traveler in sight. We headed up to the second floor to us the early bag check and again no one in line. Checked our bags, flying Southwest, and headed to the train. It arrived in less then a minute and we were in terminal 4 in 10 minutes. Seriously this is the only way to go if you are flying out of terminal 4.