total annihilation aircraft were pretty fun things to blob, although they were fragile and vulnerable to splash damage, particularly to the flak weapons that were added in the expansion. a glorious thing about total annihilation was the ballistics model: ground units without dedicated anti-air weapons could attempt to fire their guns at aircraft -- nearly all the time they'd miss, but occasionally a heavy tank could land a lucky hit and maybe take out a cluster of aircraft.

my favourite highly blobbable unit for fooling around in single player was advanced construction aircraft. i guess if you've got enough resource income to support 20+ advanced construction aircraft rush building lines of long-range artillery, you've probably already won.