Yes. Anything with rotors, propellers, though, don't expect to work in TS. Black Hawk, Siege Chopper (<3), Spy Plane. All of the voxels will also be bigger ingame(ra2's scale is like, 20% bigger then TS's), and look generally duller then in RA2, as well. It's quite funny that a Battle Fortress could run over the Mammoth Mark 2.
RA 1.5's dead. I work on TS 3.0 AGAIN.