Deadhead in the sense that they walk up to the gate and say, "Give me an open seat I need to get to XYZ?" No. If a FAM is traveling solo, they are probably flying to attend a conference, or training, etc. In that case, they are subject to the same rules that an armed LEO are. Like filling out the "hours" of paperwork, etc. So theoretically, buckeyefanflyer may have seen a FAM. More than likely though it was a LEO.