It would be a break to see cumulous clouds of an approaching front, or if nothing else just a change of scenery. Aircraft coming out of clouds would be nasty surprise, too.
Could the weather work something like the convoys move? A storm or other weather phenomena could extend for X number of miles and move across the game world.
High cloud preceeding a warm front, Cumoulous advancing across a clear sky with and whithout squall lines in the fore of a cold front.
Areas of fog could move like storms.
by changing the frequency and routes, more realistic and different climatic conditions would be a chieved.
