This is just silly. If you are the President of the United States, and you want to impress your childhood friends, why go through the trouble of flying down to meet them? Especially since the country is having a rough time lately, that's a lot of money!
Here's how I would had done it:
Find the next "VIP" government flight between Hawaii and DC that still had two seats left. Put the two guys on that flight, if anyone asks about them they are "under Presidential Orders." When they get to DC, pick them up in a Secret Service Yukon and drive them to either Blair House or the White House, where they'll stay as guests for a weekend or whatever. Plus they get to hang out with their buddy who happens to be the President of the United States. And all of this at very little cost to the taxpayer, since the VIP flights would had happened regardless, the friends are basically flying space available.
Much simpler and easier to fly a couple guys to DC, house, feed and keep them entertained than to run a 20-car motorcade, which inconvenienced everyone around it, cost money and was simply wasteful.