Port: Friendly, Starboard: Go Away.
I can't remember where I first heard this Port Side = Hello etc ...
I do have the photos taken in the Straights of Hormuz of Iranian P-3K's flying alongside our MPA's. Some of the passes to port included them lowering their undercarriage while waving and smiling.
The passes to starboard were usually from height astern and made at a greater speed although always conducted safely.
The same rules were not always applied by the Russian Navy, who were always a bit cavalier, although the Russian Air Force Foxhounds and Flankers behaved in a Port=Friendly, Starboard=Go Away fashion.
Curious to know if anyone other than MPA people experienced this ... or gave it any thought ... when it happened.