Originally Posted by fireflybob
in the military there is much more emphasis on LOOKOUT since apart from anything else if you don't spot the enemy first he might shoot you down. So it's surprising to see that recent midairs have involved military operated a/c.
Which reinforces my feeling that the Mk 1 eyeball doesn't cut it. You just need to fly in a TCAS equipped aircraft to realise how much "invisible" (but transponding) traffic there is out there on a clear day. Get in the haze under an inversion layer and you've got to hope that the big sky theory works! I'd rather have ADS-B.