I have two ideas in mind for the BETA version. Im sure these have been brought up numerous times... The first idea is the addition of contrails. The second addition is a "hi-resolution" texture feature for the clouds. Here's how I think this is feasible.
For the contrails:
-Allow contrails to be enabled/disabled in the "Advanced Graphics" options menu in the clipboard in AH2.
-Make the contrail visibility relative to the "Object Detail Range" settings.
-Use same textures as fuel/oil/radiator smoke but make the contrails more white in appearance. Also have the contrail smoke linger further behind the aircraft so it doesnt look like fuel/radiator damage.
For the clouds:
-There could be a feature installed in the hi-res texture package that allows for detailed clouds. The clouds look fine as is, but I think itd look stellar if the clouds were 3-D.
-Once again, allow "Detailed Clouds" to be managed in the "Advanced Graphics" options in game so those with low-end systems dont suffer.
-Mix up the cloud colors a little bit. If clouds are very dense, use some dark gray colors to simulate potential storms.
-Add cumulus, cirrus, and other forms of clouds. Stagger them at appropriate altitude.
This is just my idea and I was also wondering if HTC have tried testing these ideas before. Assuming that these graphic features consume a lot of system resources, those with better computers can have the benefit of advanced graphics without the low-end users paying the penalty of the game's graphics.