Second security screening when connecting at CDG
Recently returned from a BUD --> SFO trip connecting at CDG both ways, all AF flights. Outbound, we did not go through security when connecting at CDG despite transit from one terminal to another, because, I thought, we had remained within the sterile zone.
On return trip, however, we were required to go through security again at CDG between flights despite identical situation -- transit from on terminal to another within sterile zone. Of course, this time our inbound flight was an hour late on a 1.5 hour connection, and we barely made our next flight, as did our luggage.
Anyone care to speculate why we had to go through security again when connecting only on the return trip despite remaining within sterile zone? This occurred on June 22, before the recent step-up in security.