Applied on-line and waited several months before I heard from Delta. Had a phone "interview" in which they ask you a few questions to determine if they'll offer you an in-person interview in Atlanta. The STAR method of questioning is drilled into your psyche from the moment you talk to any human at Delta. STAR= Situation, Task, Action, Result. They expect you to answer all questions in that format.
I flew to Atlanta and spent the better part of the day there along with another 50+ people also interviewing. To start off the day they disarm you and make you feel at ease by lining up against the wall (about 30+ Delta employees, Flight Attendants and corporate employees) while the candidates are sitting in the middle of the room and they all break out into dance! I thought it was a nice way to take the edge off and make you take a deep breath and relax.
Then they break you up into 4 groups, each doing a different activity at a time. In no particular order: an information session about Delta in which every candidate stands in front, introduces themselves and talks a little about themselves; a Q & A session with current Delta Flight Attendants; a reach test (overhead bin scenario) and a photograph of you by the sweetest Southern lady you'll meet all day; another session is to return to you the documents (passport, license) that you handed in at the start and to review your application one final time and sign it; and finally an individual interview by a Flight Attendant and a corporate/HR employee.
In the individual interview, answering in the STAR method is encouraged.
At the end of the day, they brought us all back together and called out 3 names that they want to "review passports" for (bogus, I think, because they had done that earlier) and as the rest of you are sent back to the terminal to fly home, the entire group of interviewers stand outside the room clapping, as in a celebration of YOU.
I thought I did well and I was happier after this process than the times I interviewed with other airlines because Delta seemed lighter and more fun, less stiff. I thought surely out of 50+ people they would be hiring more than just 3 and I kept hope alive despite previous experiences and the knowledge that they usually offer you the job on the spot. A few days later I receive the NO in the form of an email. It's heartbreaking because I know I would be a great addition to the team, but all you can do is keep trying until somebody says YES. This is truly my dream and I wont stop until I get that chance.