USAF AWACS aircraft, (707s) are really loud. My grandma works on Tinker AFB, I got to go out and see some AWACS action one time, it was great. I was down there for a week and at about 10:30 at night we ended up right under the flight path for AWACS approaching Tinker, I thought a flight of F-16s was passing over. The entire house was vibrating, it was sweet!
B-1s are really loud too, one was sent up here to Kansas City for a 4th of July celebration a few miles from my house. My house is on a hill, and we didn't make it to the place in time to see it up close, but I was standing in my back yard and I heard this thunderous roar and I looked a few miles off and saw the B-1 doing a REALLY low level flyover. It was probably 2, 300 feet in the air.
727s and 732s are really loud as well. I was taking photos of departures one Monday morning during spring break a year and a half ago, standing on the top of my dads truck about 1/4 of a mile from the runways end...and this AA 727 flew right over me maybe 150 feet in the air, could've been 200. I almost fell off the truck 'cause of the noise (maybe part of it was trying to track it with the camera, but it was still REALLY loud), it was excellent.