Originally Posted by
mnttech
The FAA data base says there are about 7 707s and 8 DC-8 still registered. That has to happen every 3 years, but does not mean the aircraft can fly. Doubt if there are many left of either in the world,
The US Air Force still uses the KC-135, but most of those have been re-engined (I think.....)
I don't know which ones are still 'active', but many DC-8s were re-engined with CFM56 engines, so they may well be the handful that are still flying.
There are some military 707s still on active duty - most are equipped with CFM56 engines, but I believe the USAF AWACS have JT3D engines (they put CFM56 engines on the NATO 707 AWACS but not the USAF - no idea why).