To have a fleet size of 14 or more planes in Beginners World #3 when a lease for a DC10-30 for instance is around half a million dollars (x 4 months prepay makes that 2 million dollars) and its only week 20? This is one of the main problems I have with Airwaysim.. it takes a long time for companies to make money then build up that money so they can get another plane... it makes no sense and makes one wonder how..
One of the key aspects of this game is to gain control of the first/business class market. Never operate an all economy flight, even if it shows no demand for other classes. With low enough prices you can often get C-class passengers that don't show in route planning. Non-economy passengers make the money, as they do in real-life.
If you have a business class on all your flights - apart from those with very low demand - and get a good CI the profits will come :D
Dave
Next to my "bread" job I own a small firm charting out boats. I can tell you: it is the same story in real life :-) Patience will reward you. Find a niche market!