Here's a possible sighting. From his twitter account, it sounds like he might be from the Seattle area, but I suspect he's travelling. I can't tell where he might be located currently. I've asked for more information.
Liam Hauck @liamsa12thman 2h2 hours ago
It's always cool to meet people at airports, but it's even cooler when those people are currently on the amazing race. #MetTheCameraManToo
5:25 PM - 8 Jul 2015
I haven't heard back from him yet, but Xarles found his Facebook page and it appears he saw them at the airport in Poland. Doesn't say which one, but probably in Krakow? Talked about many delayed flights, seeing the Green team and talking with the camera man.