Here we present you some possibilities of how you can inform yourself about airlines. On the Internet there is a lot of information about well-established but also about less known airlines.
For many passengers probably the most important question -> How safe is the airline I use?
You can inform yourself here:
It is also important how good the service is aboard the aircraft, what menu there is, and if food is offered at all. On short- and medium-distance flights, some airlines do not offer a complete menu but only snacks.
You can inform yourself here (in German language):