Not to be paranoid, but the U.S. intelligence people, under pressure for their past inattention, have certainly put in place a significant data-mining process that - guessing - requires airlines to bring certain kinds of ticket purchases to their attention. From comments in the media, this is likely to include case purchases of one-way tickets, and in some view or another, an RTW might seem like a one-way ticket. For whatever reason, our very middle-of-the-road caucasian family was SSSS'ed regularly for a while after originating an OWE ex-CAI. Maybe no connection.