Peter R. wrote:
Ron Natalie wrote:

Yes, it is one of the few good things that can be said for
TCAS.

Why does this sound negative to me? Are there major disadvantages of TCAS
that outweigh the advantages (besides the cost)?

The DHL midair in Europe a few years back comes to mind - although I
think that was more a case of two different schools of though in dealing
with TCAS alerts.