People have been using the Aero Ektar for on many different cameras for a long time. It's just recently in the past few years or so that it's become so popular. As other's have stated above, most typically it is fitted to a Speed Graphic. This involves the least amount of modification to use the lens.
John Minnicks has perfected what he calls the Aero Liberator which is a modified 3x4 R.B. Graflex Super D that he rebuilds to take the Aero Ektar. His mod takes a significant amount of work and many man hours and is accordingly priced very high. It involves rebuilding the camera with 4x5 Graflock back, and redesigning the mirror so that the lens can focus at infinity and still allow the path of the mirror to be unobstructed.
I've seen them on everything from Speed Graphics to Deardorffs. In addition to Packard shutters they can also be put into various large shutters like the Betax 5 and Ilex 5. I know S.K. Grimes does this but I'm not sure if it reduces the lens's max aperture. The easiest and least expensive route is to put it on something that has a focal plane shutter as others have mentioned. Understand however that some modification will probably be necessary to make it fit almost anything outside of a Speed Graphic.