The entire interview process at Delta was very possitive.  They will fly you in the day before, though you have to find a place to stay.  Most people stayed at the Comfort Inn airport.  Had to be there at 7:50am the next morning.  I wore a black suit, white shirt, bright red tie.  I know there are lot of rumors over what to wear, look professional, that it all that matters.  Met by the folks there and taken back into a big conference room where we were all welcomed and given a little bit of a pep talk.  From right off the bat, they were extremely friendly and very professional.  The panel interview went in alphabetical order, so being in the front of the alphabet, I interviewed first.  The panel consisted of two line captains and an HR person.  They were very laid back and extremely personable.  It started with the HR gentleman going through my entire application line by line, asking questions along the way.  I had a speeding ticket on there and he just laughed and said "Wow, that's pretty good, only one?." So I guess he has seen some with quite a few on there.  If you have just a few tickets, I wouldn't sweat it.  The questions by the HR person were: Why Delta? How did you get into flying? What are you doing now? Several of that nature.  After that the line captains went back and forth over "Tell me about a time" questions.  What would I do if I hot started an engine and it barely went over the limits? Maintenance looks at it says your fine, then it happens again.  Do you still write it up? You land at an airport 40 mins. early and have to leave the passengers on the A/C for a while, what do you do? Your captain decides to shoot an approach during a thunderstorm, what do you do? The questions lasted only about 30 minutes.  Not a lot of feedback is given during the questionning, but never did I feel uncomfortable during the whole process.  I took my jacket off when asked if I wanted it hung up. I drank the water several times.  They want to hire human beings, not robots.  Be yourself, and be extremely honest.  After the panel interview, I took the 75 questions in 75 minutes computer technical test.  It really helped me that I read the ATP Gleim book cover to cover a couple of times.  The questions are reworded but almost the exact same content.  I finished with about 15 minutes to spare.  It was the part I was really stressed out about, but it turned out to be not so bad.  After that test, I went right into the psych test.  They let you pace yourself throughout the day so you don't feel rushed. You can take brakes in between each test as not to drain yourself throughout the day.  I went into the psych test not knowing much about it.  It was 224 questions of "Strongly agree-agree-neutral-disagree-strongly disagree." Be consistant and be honest.  It took me less than an hour to take.  After that I took lunch.  There is a nice deli on campus which made it a good time to just relax and breathe.  After lunch I went back for the cognitive skills test.  If you are good at video games, you should do just fine.  I took the trial offer online, not the same tests, but a good idea in practicing memory and hand speed.  The cog test had 12 different tests in all.  Number memory, sign orientation, balance the ball on the beam, those sort of tests.  At the end, you just have to hope for the best.  It is all scored on your reaction time, and accuracy. It was sort of fun, but all but a little nerve racking.  After the cog test, we all sat in the sitting room waiting for our scores to be tallied. They called the first guy in, he was gone for about 15 mins., and then came back and said he got the job.  They called two more guys individually, of both didn't make it.  After waiting for about 45 mins., he called myself and two other guys in together.  He offered the three of us the job.  I guess it didn't matter if you were called individually, because some made it and some did not.  After that, we had to fill out more paperwork, do a drug test, got fingerprinted and had our ID pictures taken.  It was about 4pm when all is said and done.  Went back to the hotel, for we had to be back at 8am the next morning for day 2.  It consisted of a medical exam at a clinic just up the street from the training center.  Nothing more than a very thorough 1st class medical.  EKG, and having blood drawn were the only exceptions.  Next they bussed us back to Delta for the MMPI psych test.  550 true/false questions.  Just be honest and consistant.  After that we went the psychiatrist office about a 30 min. ride toward Downtown Atlanta.  The doctors were very nice and only asked questions like "How is your family life? What got you into flying? Any trumatic moments? ect." Headed back to the airport once everyone was done.  They had positive space tickets for us to get back home.  And that concluded the entire process.  I found it to be an extremely pleasant experience and look forward to working there.  The moral seemed higher than any of the major airlines out there.  I talked to the pilots who flew me there and back, and they all said it was a great place to be.  Study, be honest, and professional and it will go well.  Good Luck.