She said that employees' participation in SEC's frequent flyer program is voluntary and that SEC's savings have been minimal, in part because frequent flyer tickets do not give travelers flexibility in arranging their travel.
Frequent flyer miles give lots of flexibility to travelers.
mnli hypothesis: Frequent flyer miles give lots of flexibility to travelers. premise: She said that employees' participation in SEC's frequent flyer program is voluntary and that SEC's savings have been minimal, in part because frequent flyer tickets do not give travelers flexibility in arranging their travel.