Old Nov 19, 14, 8:32 am
FlyerTalk Evangelist
Join Date: Dec 2007
Location: BOS/ORH
Programs: AS MVPG 75K
Posts: 18,002
While it is a good idea to set up accounts with any multiple carries to collect any unexpected miles, you really should try to focus on just a few carriers.

It really is dependent on what airlines and how old the retroactive miles are. Some carriers don't let you credit flights flown prior to joining the program.
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