It was an all day process. Starting by entering a room with a welcoming committee lineup of Delta employees that you later learn are all flight attendants on temporary assignment doing the FA recruiting. They chat and mingle and this is when you really need to shine and be the perky, bubbly outgoing FA that they are looking for. Make sure you get a good night's sleep beforehand and a good breakfast too!
First everyone (100 candidates maybe) goes into a room where they tell you all about the position and you can ask questions. Then the candidates are divided into four groups. So each group is doing a different part of the interview, in a separate room, at the same time.
One part is a pretty casual sitting around and they ask if you could go anywhere and take one person with you, who would you take, where would you go and why?
Another part you have to demonstrate that you can reach an overhead bin, buckle the seatbelt (without needing an extension; they can't weigh FAs anymore, but this is a safety concern) and read a 30 second on board announcement.
The grueling part is where two interviewers grill you with a bunch (6 or so) really hard situational questions, in which they want you to draw on your past work experiences and answer in the STAR format (Situation, Task, Action, Result). I found this particularly nerve racking, as the questions didn't really apply to my current line of work, and trying to drum up some situations from 10+ years ago with two people scribbly furiously, well... I really wished they had asked things more along the lines of, what would you do if?