I've recently started the game and I am really enjoying it. But one puzzlement is that there seem to be so few small commercial aircraft types. I've started an airline in the 1950s period but the only small commercial aircraft I have seen are the DH dragon/dove and heron - for example I couldn't find any second hand Lockheed 18s which would have a small payload but a decent range. I have another in the ultra modern period and the only thing I can find smaller than an Embraer Brasilia is a Pilatus PC12, no cessna caravans or Beech 99s. Are the small aircraft there but just all snapped up, or is there a gap?