The process was very competitive, so here's a few tips.
1. Bring a hard copy of your resume.
2. Have a speech, or a few points ready when they ask, "Why do you think you'd be a great Flight Attendant?"
3. Don't gloat if you make it to the f2f portion.
4. If you make it to the f2f: be honest, be relaxed, be confident, and smile!
5. Research the company.
6. Dress comfortably.
I got my CJO in 7 days following those steps.
I interviewed in Chicago where there were about 100-120 people. They split us up into two rooms; 30 in one, and the rest in the other. I was in the smaller room. I had prepared a speech beforehand, but I just pulled points from the speech and elaborated on them. Please stay within the 60 seconds! There was one woman who was awesome; her speech was absolutely amazing. But she spoke for 3-4 minutes and they want to make sure you follow simple directions; she did not make it to the f2f. Another woman did great and stated she had a specific personality type. The 4 people after had stated they had the exact same personality type-DO NOT DO THIS. You have to be creative and you have to be confident. I focused on the job that I believe prepared me most to be a flight attendant and told them why.
After the group interview, they chose about 15-20 people for the f2f. Again, it's very competitive so be prepared. My f2f lasted about 20-25 minutes and I had a great time. I made sure to make my interviewer laugh, and he did the same. I had 3 questions to ask him and he answered each in detail, and was excited to do so, even though it was midnight. The questions are all here on Glassdoor. I received my CJO a week later and start training in March!
I believe what helped me was, I researched and felt confident in my speech. Even though my voice shook a little, my words were strong. I also didn't gloat when I saw I had a f2f. They post the list on the door, and everyone finds out at once. I know for a fact that 2 of the people who were loudly boasting, received a TBNT email right after I got my CJO. Recruiters are watching you at all times.
Lastly, I wore a comfy outfit. I had a beautiful blazer, sleeveless dressy shirt, slacks, and a low heel shoe picked out for the interview. I had an hour drive, so I thought I put my blazer in the backseat of the car. Imagine my surprise when I got to the interview and it wasn't there. I had left about 2.5 hours prior to start time, so I still had about an hour to find a new shirt. I went to the nearest Walmart and the only things they had were t-shirts, sheer blouses, and shirt/cardigan combos. I chose the shirt/cardigan because it was my style (I'm not a dressy person, I have to go buy 10 new outfits for training). I also had on minimal makeup, darker lips, and wore a necklace without earrings. My hair wasn't in the typical bun either. Even though I didn't look like a flight attendant, I was chosen because I was comfortable and presented myself as such! Please dress professional, but comfortable, and it'll show. My interview lasted 6.5 hours and I still had a smile on my face at the end of it.
Good luck to you all, and I hope to see you in the sky!