You probably have gotten a request similar to this in the past, but here's my idea.
You could add a dynamic weather system depending and varying on the map your playing in. For example, if your in a desert, there could be a chance of having a sandstorm. Or if you take off from an aircraft carrier in rough seas, there can be thunder and lightning happening all around you!
Certain weather conditions can have drawbacks such as slower aircraft speed, turbulence, and visibility.
As well as advantages, if you're in a sandstorm it can be harder for AA to spot and shoot you down. When your inside of a sea storm,
the clouds can provide you cover.
There can be a option to turn certain features off, which can be toggled on or off in settings.