I'm in the process of getting my PPL, have gotten into USNA, and I agree with what everyone above has said regarding the potential benefits. For me, I was able to weave it into my essay in order to demonstrate some lessons that I had learned and how I had grown, and I used many examples from my experiences to answer interview questions. However, there are undoubtedly plenty of other activities/sports you have done that would be just as good answers if not better. One thing that ended up being pretty cool was that for my nomination interview, 4 out of the 5 interviewers were former pilots. They asked me about flying, and we all started talking about it and hit it off right away, so it made the interview go well. But in the end, I don't think it was a make or break factor in my application by any means. I've had a blast learning to fly, and if you have the time, money, and passion to do it without sacrificing other important aspects of your application, I'd say go for it if it interests you. Even getting several hours in or just to a solo could be helpful in determining if this is a career you may want to pursue. Just my two cents and personal experience for you. Hope this helps!