Originally Posted by
zombietooth
At IAD, you have two ways to go upon exiting an international flight; one way to arrivals and one way to connections, where you will remain midfield. At the midfield facility, you will clear immigration and customs and then recheck your bags. If you kept your bags, you would have to get them through the TSA checkpoint to access the concourse and exit. I don't think that it's possible to do this.
So he will go to arrivals then. Immigration is not concerned that he is skipping the leg. He is arriving at 5:40 am anyway and his next leg is at 6pm. He has a meeting in town, or an emergency at home, if asked.