The interview process here is a ludicrously disorganized, drawn out and time-wasting experience. Expletives would be very helpful in really describing the process.
Screening calls are done by outsourced recruiters with little knowledge of the aerospace business, or even recruiting. A number of outside vendors are used, and the only thing consistent here is that the quality is poor. They are generally unresponsive to emails or phone calls. Follow-up questions usually go unanswered, multiple requests to forward thank you emails have been ignored. If they do respond to any questions it is usually to state they don't know, before a game of email pingpong begins with other recruiters or the requests disappear into the blackhole that is Pratt and Whitney's seemingly non-existent HR.
Interviews with hiring managers/teams vary. Often a mix of behavioral and technical questions, seemingly no standard format or process. Some will state that multiple interviews will occur, the length and number of which may vary. Make no mistake, the job you are interviewing for is in fact needed because everyone at P&W is chronically overworked. Since everyone is overworked, follow-up interviews may not even take place in the same quarter, and rescheduling at the last minute is common and being blown off entirely without even a warning is something you should be prepared for.
Not everything is bad though, if you somehow get through the 3-15 months that it may take between applying for a job, getting an interview and being told they are going to make an offer, you aren't in the clear yet. An additional time period will then pass as Pratt HR fingerpaints you an offer letter only to have the hiring manager retire, or quit before you receive the offer and then the role gets administratively canceled, thus saving you from whatever agony you would have otherwise experienced actually working there.