“Sport i would have thought is defined as an activity were some competition and winning is involved, so other than air racing, flying light aircraft is not a sport, it's a hobby.”
There are plenty of recreations that are also a sport, Golf for a start it’s not a win or loose game for most, you aim to improve your handicap but most never take part in a competition, cycling, marathon running, horse riding, some set targets some just to keep fit. Light Aviation isnt particularly competitive but Gliding can be very competitive and is becoming more so.
So there is no distinction between Sport and Recreation.