First suggestion post (whoa!): I think about "AirwaySim" and other...

[MrX_ua]

My personal (and only) note to this.. I'd imagine an airline Sim to include companies so small, that their fleet only has 8 seaters biplane props that are more of an air-taxy or hard-to-get places routes.. But if you can afford - start with a lease on a 787

And here is a picture to support it all - an actual, active. major airline airplane .....Click to see