So I've managed to reach level 8 and I currently have 46.97k on me.

With my current earning of 2.26k /d, it's going to take me a long time to reach 81.4k which is the amount I need to buy the next plane (DHC-8), more than 15 days. Level 9 is a decent while away too.

Somehow I think saving up 97k for the next plane (BAE Systems 146) was a mistake. Doing the 'Offers from other airlines' gets me somewhere around 600-800 now.

What is the fastest way to progress without spending real money on the game?