In article ,
Larry Dighera wrote:

And does every aircraft have this system these days, regardless of
size?

No, only passenger jets are required to have them.

The military is starting to equip some of their aircraft with TCAS
also:

The USAF started equipping aircraft with TCAS more than 5 years ago.
Heck, the C-141s equipped with TCAS are already being retired.

--
Bob Noel
looking for a sig the lawyers will like