Once again a call for help. (I am on a PC running Windows 10.)

I have now met and joined all factions. But wanted to continue to build the relationship with Danse to get the perk. I left him at Boston Airport just before I teleported to the Institute. Now I am back. I hear him near the workshop where the teleporter was built (and I have walked all over the airport) but cannot find him. I have had this issue with MacReady and Caitlin, too. I leave them, usually in Sanctuary, and then it takes me a while to track them down. Only Piper was easy to find at the newspaper's HQ. I wish there was a way to whistle and get them to show up (ditto for Dogmeat when I had to follow the little so-and-so to Ft Hagen at night).

Does anyone know where Danse usually hangs out at the airport? Or, is this a glitch? (Reloading a save did not help.)

In advance, thanks. regards, RC