Airline interviews vary by the airline and its culture. At the regional level, it's pretty much a pulse and the ability to fly an airplane. Major airlines hire differently; where you have Delta that has cognitive, psychological, and technical tests versus an airline like Hawaiian Airlines, where there is zero technical testing and their only quest is to get to know you personally to see if you are a good fit. Airline training is well.....airline training. By the time you're interviewing at major airlines, you already have a grasp of what to study for and how to handle ground school when it comes. It's the same at every airlines. Company policies, procedures, and the do's and don'ts. After that, you branch off to your respective airplane for simulator training and maneuvers validation.