RISE OF FLIGHT
This is the ultimate First World War flight -sim on the PC. It is a unique flying experience.
The game itself is old but still holds up well despite its age.
The community gets a bad reputation, but my experience has been 100% positive. It is one of the friendliest environment you will experience on the net. The game can be played as a single player or you can play multiplayer. There are organized "squadrons as well. Despite the age of the game and a lot fewer players within the multiplayer community, it still has a strong dedicated group. Below is a video produced by the community about the community.
Rise of Flight United Edition can be downloaded for free on the website or via Steam. You received three pretty decent planes. There is a small sample of missions you can play. I recommend playing the free version first. If you enjoy the game, then you can wait for the next sale to purchase some other planes. This is NOT an arcade game. This is a flight simulator. The planes fly like would during the time period.
I should note that an updated version of the game called "Flying Circus" will be released supposedly in late 2018.