<font face="Verdana, Arial, Helvetica, sans-serif" size="2">Originally posted by tokiovd:
Do United or American honor the FF miles accumulated on trips purchased through third parties (e.g. Orbitz, Travelociy, etc.)?</font>
Yes and no.
Yes, if the third party is a travel agent or an open site such as Expedia and those you list - where you choose the airline and flight, get the price, then book the seat(s).
No, if it's a closed site like Priceline, where you give it the date, it finds a cheap flight, and you have no control over which airline you end up on.