I applied to PSA on 9/15, and within a week had a request for the video interview. The video interview is five questions, you have one chance to record each, and then a minute between each to prepare your answers. I would recommend looking through the questions that people have mentioned here- as nothing threw me for a loop. Once I had turned in my video interview, the same day I got a request for a face to face interview in Charlotte, NC. They had six dates available over the coming two weeks, but they fill up fast, so make sure you pick almost as soon as you get the offer. I chose a Wednesday two weeks out from receiving the original request- if you live over 4 hours away, they'll cover your flight out, and have a request form that you fill out. Have a look at AA flights that are available- you can request times, but not exact flights, so bear that in mind. They also do not cover a hotel, so if you're going down the night before, you will have to pay that out of pocket (I did, simply because I didn't want to risk a delayed or cancelled flight morning of).
The morning of the interview, turn up to the location EARLY. My interview was at 10, I got to the hotel at 9:15 and there were already people there before me, and make sure you start getting to know the people you're going to be interviewing with! There are lots of breaks during the process, and it's a good idea to keep socialising and connecting with the others around you. My overall group was 17 people.
After checking in (don't forget your passport) the interview itself starts with introductions- you walk down the 'aisle' between the rows of seats and introduce yourself to the group: your name, where you're from, and a fun fact. You then pick an announcement card at random and read from it.
The second part of the interview is a panel interview- the larger group is split and you'll be asked two interview questions. They have a big long list to pick from, so make sure you prepare, and make SURE you use the STAR method when answering. I would say 80% of the questions people have posted on here are ones you might get, so definitely prepare them- or have one scenario that you can tailor and edit to work for any situation.
After that, there's another break, and a short presentation about PSA itself, and life as an FA. Don't let this scare you off- if you've done research before getting to the F2F most of this is easily accessible information, and a lot of other stuff the recruiters mentioned during this portion was really reassuring.
The last portion is a one on one interview with a recruiter- you're called in one by one, and are asked why you want to work for PSA specifically (this is a great time to bring up the company values and mission statement, I also bought up how I'd seen their LGBTQ FA spotlight for pride month, and how as a queer woman that made me feel incredibly seen already). You briefly go over your resume, talk about work experience, and then have an opportunity to ask questions. Make sure if you have any that you DO!
Overall, the whole process was a lot quicker than I was expecting- we wrapped up at about the four hour mark, and my CJO was in my inbox by the time I got to the airport to fly home.