It's booked and paid for by Delta. For indoc it's the Staybridge Suites. Decent hotel with breakfast 7 days a week and beer, wine and dinner included on weeknights. After indoc though, you are 100% on your own.

When I went through, the Staybridge would give you $99/nt after indoc but you had to book the entire 3-4 weeks with them at once. Not such a great deal if you're one of the folks headed to MIA for part of training. If you do go to MIA though, Delta picks up the tab for the time you aren't in ATL.