DTVAirport,
I think your efforts are valiant, however, I personally think you are going the wrong way about it.
You are comparing fuel burn of aircraft between 19 and 72 seater aircraft.
Surely it would be much better to determine your target market, calculate predicted demand and speak to airports etc. to calculate your fixed costs before looking at variable.
For example, if your market can only sustain the 1900D and your fixed costs are £100 per passenger when operating a full flight, you know it isn't going to be viable.
My advice would be:
Discover your target market
Talk to airports, look for stats on CAA website etc.
Calculate fixed costs
Look how demand fits in with economically viable supply
Then start to look at aircraft, crewing, insurance, maintenance, on board etc.
I love your passion for it though!
