I find this just another act of how crazy things are.I have to laugh dening a S.S. agent boarding,well I'm sure someone will get fired over this one.
I worked many years with agents in the S.S.
and beleave me they can do things you can't even begin to imagine. I figure his idenity could be verified in less than 5 minutes anywhere he is in the world,they have a communication system like none other.
Regarding traveling by commercial planes they do it all the time.