Itīs simple math that shorter routes get a higher margin.
But then again, regarding your starting dates, you just played for one real-life day ! There is no way to tell how route strategies will turn out.
Easy rule is to serve one destination as often as possible, regarding the oversupply and departure time rules.
And if you want people from outside beginner world to help you, you have to be more specific about data. We outsiders canīt have a look over demand,supply,competition and flight data.
But then again, remember PATIENCE. One side of the entertainment of this game is finding out yourself. What use is it if you just act as advised ? Donīt be afraid to prove things for yourself and find out after time.Frequent bankruptcies are common along beginners and even with some experienced players trying something new. This game is intended to entertain you over years. If itīs too easy, youīll get bored and will lose interest soon.