NBAA director of seminars Sandy Wirtz is retiring at the end of this week. Since joining NBAA in 1996, Wirtz has helped ensure that NBAA’s seminars, conferences, workshops and committee meetings run smoothly from start to finish. She has been responsible for site visits at each of NBAA’s events, contracts with vendors, negotiating hotel agreements, signing speakers and coordinating on-site logistics. NBAA has not yet named Wirtz’s successor, and a spokesman told AIN that NBAA plans to hire a meeting planner.