ATA Airlines- New Schedule Released?

I'm looking at flying from either Indy or Louisville on ATA in mid-May and they still haven't released the new flights past May 9. Anyone know when they release the new schedule? I've looked on their website; I've called them directly (got a generic "at the end of the month" answer). I don't want to wait much longer to buy tickets because Delta has already increased their flights $40 since the beginning of the year. Thanks!