Aaaaand this is getting enhanced away. Just received this email:

Multi-City Flight Reward Bookings
Beginning September 1, 2019, members can continue to make Flight Reward bookings to multiple cities, but they will be limited to a maximum of one stopover or one open jaw, in addition to the point-of-turnaround. As today, for travel within the same continent (except for travel wholly within North America**), one open jaw is permitted but stopovers are not permitted.


RIP. get all your bookings in before September 1st!