Originally Posted by
hard2please
Yes, but be aware that some of the lowest fares on Singapore do not earn any miles so check the rules before you book!
On other airlines as well. I fly Thai and Swiss once in a while. I always book using my UA FF number. The Thai miles are no problem. I get them every time. The Swiss miles, on the other hand, depend on the fare I pay! I don't enjoy finding that out AFTER flying Swiss, so am now aware and make sure I book a qualifying fare class.