PEI_3721: This reminds me of how some people look at anti-lock brakes...they trust the box to do the braking. In fact, on one of the planes I fly, I had a chance meeting with a guy that was part of the certification process. He stated the test pilots could beat the braking distances about 35% of the time. That said, they didn't beat it was by much, so just mashing down on the brakes and letting the box do the work is the defacto braking method for most pilots. Does Nascar install anti-lock brakes: No. I have landed on very slick runways, snow, ice...gravel, ect where the box just coldn't figure it out, and I just kept going. TCAS: I gave some exampes where listening and doing what the RA tells you do, could get you in trouble. I can't speak for airliners, but TCAS installed in the planes I fly, can only tell you to climb or descend...not turn right or left, or slow down, or wait and see, or whether there is a radio tower just below you..on and on. Again, if the pilot can't make a judgement a judgement call, you might as well, have my Pomeranian flying the plane.