The latest AirwaySim scenario, Euro Challenge, has just started. This scenario is part of the "mini scenario" group and lasts only for around 2 months (~10 game years) and has relatively hard economic settings combined with the regional limitation of Europe-only. Game day time is also shorter, 25 minutes per day.
All aircraft models are included and AirwaySim Achievements can be also earned from this game world.
https://www.airwaysim.com/game/?gView=121#game121