I'm generally not afraid of flying. However, for me, PIT-IAD about 5 years ago in a UA RJ was quite the scary one. VERY gusty conditions in the D.C. area that day. As far as I can remember, during our descent from about 5,000 ft., the plane was consistently being tossed about with ease until touchdown.... which is why we had two go 'rounds. Finally landed on the third try. We were one of the last, if not the last arrival as the airport shut down due to the conditions.