I should have added that I also get a FS ident for the "missing"
aircraft in top-down view even though the aircraft is invisible in other
views (eg. spot, cockpit). This happened a few weeks ago when I was one
of several a/c queueing for departure and Alastair (JHB180) was
invisible to me but I watched him take off in top-down and TCAS. I
could see all the other a/c.
Only very occasionally do I fail to see another aircraft during an ATOC session, and when this happens it appears to be only one aircraft - others are there OK. What puzzles me when this happens is that I still get the TCAS echo for the "missing" a/c.
Can I ask which pilots never see other aircraft in ATOC sessions?