Are these new Basic Economy seats making the "Seats not Assigned" info on Travelnet very unreliable since these tickets don't get assigned a seat until check-in now? Looking at spring break travel, and flights are showing 20-25 seats not assigned, but the Auth/Avail page shows them oversold. You can't buy a coach seat on delta.com, so they are actually oversold. Need to be heads-up commuting, I guess, too. I've usually found the Seats not Assigned to be pretty accurate, but this may render that page useless now.