Many years ago I worked for a guy (ex TWA) who ran an "airline" by doing a sort of arbitrage between chartering whole biz class jets and selling individual seat

Many years ago I worked for a guy (ex TWA) who ran an "airline" by doing a sort of arbitrage between chartering whole biz class jets and selling individual seats. Believe it or not he did it all by sticking cards on a wall and marking the map with coloured pins. With 6 planes and 150 pax, you could probably do the same. If not, at least think in terms of keeping it simple. The far bigger question is "How do potential customers find you?" Are the flights scheduled? or run based on demand?