Interview process was just as I read online: apply online, assessment, application, video interview, in-person interview. Very competitive, be prepared, know your stuff, know the company, and plug it in the interview. They told us thousands of applied and only a dozen selected for interviews. Bring your "A" game.
Note, they will require you to answer questions in STAR format (situation/task, action, result) during the in-person interview, so be prepared and do this for your video interview as well. Regarding STAR, they want to know about you, how you handle and respond to a problem, not your colleague or boss.
Video interview seemed normal, usual customer service questions. As I read on here, the hiring process does take a while. I applied in March, had the video interview 2 weeks later, and in-person interview almost a month later, job offer later that day. I got an email for the in-person interview: with a morning and afternoon slot on that day. You will need to print out your application and bring it onsite, they will use it during the interview. Hint, from the beginning work the room, make conversation with fellow applicants and staff. Show them you're great with people. Remember their names and use it in conversation, when normal.
In-person interview stage began with half a dozen of us in a meeting room for an icebreaker, brief PowerPoint presentation, and (2) videos about the company, role, and benefits. Ice-breaker: your name, where are you from, professional background/work experience, and first place you want to fly to with Delta. Hint: Speak confidently, poised. Be prepared to pick a city where they actually fly to, know the brand and the destinations. There were several Delta managers there, very professional and happy. They took us one by one to have our individual interviews.
Bring multiple copies of your resume and cover letter, at least two, to present to interviewees. Questions were randomly selected again, they asked me (3) from their list. Typical customer service questions, one was the same from my video interview. They want you to answer in STAR format. Questions took about 10-15 minutes. Use the time after to make a friendly and organic conversation to sell yourself. Why you want this job, why you love Delta (insert Delta knowledge and how you relate to their goals.) Do your homework about the brand and be shameless when plugging it in the conversation. Separate yourself from the others and show you came prepared, care, and will represent Delta well. Know what they do in the community, know their service policy, know their history, and etc. Hope this helps you nail your interview!