It does bring up an interesting point with everything else in the industry changing. There are plenty of legitimate reasons for someone considering options to have multiple bookings. I do it all the time with rental cars. I understand why Delta doesn't allow it but maybe they should consider a policy where you can have x number of overlapping bookings until x days before departure. Especially for Medallion members who likely will end up using one of the possible bookings. Now is the time for airlines to rethink everything.