Yes, Commanche was my first experience with voxels...I was never huge into flight sims but I played it just for the graphics. :)
Really, many of the NovaLogic games (Comanche, the Delta Force series, and there were jet simulators and tank simulators as well.) I think they all used the same (or at least, a related family) of voxel + polygon engine(s).
Does NovaLogic still develop new games? They announced Delta Force: Angel Falls in 2008. Their website looks quit dated too. A new Delta Force, Comanche, Joint Operations or F22 game would be great. Sadly RAH-66 Comanche has been canceled in real life.