I don't remember any rules from my early civvie days and haven't encountered a situation similar to the scenario discussed above, but in the military I remember (for most situations) the outbound aircraft had the right of way over inbound traffic when it came to taxi priority. Of coures I figured this was sort of a military courtesy on base since inbound traffic's mission was over and outbound traffic had fuel issues to worry about and range times to make. In NGDI's scenario I have to vote with aircraft #1 having the ROW. Of course a quick call on 122.8 from the aircraft taxiing south on C could be made and let that plane was is exiting C3 go ahead of him if he wasn't in that big of a rush. I was landing in KELP once after doing some work and was maneuvering for landing on a teardrop approach when I noticed two SWA jets approaching the holdshort. I knew that they would greatly appreciate getting out of there a little quicker and not waiting for my approach to landing, so I told tower that I could hold to the northwest for a few minutes and let them clear the outgoing traffic. One and a half 360s later I was cleard for the straight-in and all was good with the world!

USMCFLYR