Also check in FS for an uninstall file for that aircraft. Go to the main FS2002 folder and look there first,it may be handy if you have the zip file handy to identify it although if you activate an uninstall it should identify itself before allowing you to proceed.
The other place to look is ADD/REMOVE Programs as some will end up there. You can also use the SEARCH option in the Start section to track down what you need to find what you need to remove those aircraft.
This mucking about ios why some of us really do like to manually install aircraft------we KNOW where the files have gone.
And ,no,I don't mean to start another debate

White on White fly all night.
Red on White you're alright.
Red on Red you'll soon be dead.