Want more planes?
go to folder
ysflightrealism/aircraft/inactive
copy wanted air????.lst file[s]
to
ysflightrealism/aircraft
Want less planes?
move unwanted air?????.lst file[s] out of
ysflightrealism/aircraft/
into
ysflightrealism/aircraft/inactive
Having less planes or specific for that theatre or era gives much better realism,
especially for computer generated opponents.