Jetrell Fo said:

Anyone know for sure if Aliens & Alien 3 had theatrical DTS?

I can say with some certainty they didn't - Alien 3 predates theatrical DTS by a year or so (first major use on Jurassic Park in 1993, as brilliantly preserved earlier in this thread), and though it roughly coincided with the first use of Dolby Digital in 1992 it didn't even use that.

In fact both these films used the standard 80's model for the big-budget blockbuster - Dolby Stereo (SR in the case of Alien 3) for regular prints plus 70mm 6-track for the big boys. Aside from discrete channels, I've never found any evidence that either of these 70mm mixes were substantially different from the surround mixes (unlike, say, Alien and that Star Wars movie).