As someone who plays with smaller planes more often then most people, I found some small gaps in the available planes in the game. Notably these three:
The tecnam P2012 Traveller is a small regional prop of which the first planes were delivered in 2020. It is in use at Cape Air in the US for commuter and charter services. It can seat up to 9 people with 2 pilots, or 10 people with single pilot operation.
De Havilland Dove
The De Havilland Dove, the smaller brother of the Heron, which is in the game, was a fairly succesful plane in it's time, operating with dozens of airlines accross the world. It could seat 9 passengers and was produced between 1946 and 1967. A few of these appear to be still in service today.
De Havilland Australia DHA-3 Drover
This rather peculiar plane was derived from the Dove, and also had a capacity of 9 passengers. This plane had some rather peculiar characteristics, such as it's tri-engine configuration. Only 20 were produced, and the type was used by among other users, Fiji Airways. This plane was produced between 1949 and 1953, just barely within the starting years of the earliest-starting game-worlds.
I hope these three can be considered for addition.