Originally Posted by
tc_jedi
I know a father/son duo who have the same name. The son lives in Japan and when they travel to see each other they use the same FF#. They've been doing this for years and have had no problems.
Similarly, the father of a friend of mine is a lifetime platinum, as well as currently an executive platinum on AA. His son, my friend, has the same name. He regularly uses his dad's FF number to get upgrades, access to the lounge, etc. Been doing it for years.
I do not know what they do about birthdates.