Ramapriya wrote:

I could be wrong but I got the impression that the 707s made more noise
than comparable-sized aircraft...

707s are old planes by now. Jet engines have gotten quieter over the years. Any
707 that still has the original engine design is going to be very loud and smoke
a lot on takeoff. Even if the engines have been replaced with newer designs,
they'll be noisier than a 727. They 707 also has four of them versus the 727's
three.

When I was working at Hartsfield in the late 70s, it amused me that I never once
saw a 707 land there, but I could count on seeing several DC-3s every day if I
were working a site that allowed me to see a runway. Ten years or so before
that, every article or column about the 707 called it a classic, with the
implication that they would be flying for decades, but they were gone by that
time and the old Gooney Birds were still trucking passengers.

George Patterson
The desire for safety stands against every great and noble enterprise.