I use onair. Doing it over the summer mostly for xplane11 but now microsoft flightsim. It´s ok. Not great but not bad, it´s ok and bring some purpose and achievements when you fly. Some bugs with MSFS but its easy to use. Little thin on job selections, -my opinion. But it´s great for a beginner, you can set different difficult levels. One big oversight from the developer is not offering a nightmode for the app. If you have multiple screens and want the app up it´s to bright.
You can try it for free for 7 days. No credit card needed. Just sign up and install the app and start flying.