Good Morning new in town and welcome,
Having lived in McLean for many years, I can tell you that McLean is a great town, and I'm sure you'll love living there. There are plenty of quiet areas in McLean that do not have a lot of aircraft noise. Parts of McLean are indeed on the approach pahs to Reagan National Airport, but that is mostly by the Potomac River. There are some other areas that will incur some aircraft noise, but it shouldn't bad at all. McLean is really not on the approach or take off routes for Dulles airport, so that should not be a problem.
I suggest you connect with a Realtor who knows the area, and have them show you around, and help you get familiar with the area prior to making a committment on a home. You might want to interview two or three Realtors to see whom you're most comfortable with, and who has the experience to assist your family with your evaluation and purchase.
If I can answer any further questions for you, please feel free to write or call. Good luck with your search.
Andy Krumholz, ABR, GRI, CDPE
Keller Williams Realty