B747skipper From , joined Dec 1969, posts, RR:
Reply 1, posted (11 years 8 months 4 days 11 hours ago) and read 2809 times:
ICAO mandated that airplanes have registration letters (numbers) near the tail and on the upper side of the RH wing and lower side of LH wing... there is a "minimum size" for markings as well... in USA apparently they dont observe the rule anymore... foreign aircraft still seem to abide by the rule -
Comes from Admiralty Law traditions i.e. flag showing on the tail as ships were doing in the old days...
Cfalk From , joined Dec 1969, posts, RR:
Reply 5, posted (11 years 8 months 4 days 2 hours ago) and read 2617 times:
Also useful for plane-to-plane identification. Some countries would send up fighters to spot-check airliners coming through their airspace, but for obvious reasons don't want to park just off the wing so close as to read the small reg near the tail.