Atmospheric mods were attempted, but none of them is going to be out soon.
Their fate:
Wings - lost in HD crash, old version exists on my HD, so a reboot could be attempted from there (I was supposed to release it as a modeldump, but files are too large to comfortably upload).
DEFCON FreeSpace - crippled by HD problems, then rebooted, the creator (Shadowgorrath) isn't very active.
Aces High - stalled due to problems with assets and lack of time. This one is mine, and I'd like to return to it as soon as Steve-O finishes his remakes and Scooby releases a few models I'd like to have. It's very low priority for me now, but at least I still have the data.