Over the Christmas holiday, I held a ticket on Continental from BOS-PIT. Since bad weather had reduced Logan to one runway and I would have missed my connection in Newark, Continental very kindly (and without prompting!) reticketed me on a USAir non-stop (standby, but this was not a problem due to the bast numbers of scheduled USAir pasengers who chose to stay in Boston rather than miss connections in Pittsburgh).

My question is from which airline (both?) should I get FF credit. My preference would be USAir, since I tend to fly USAir more frequently (this case was a price issue). Is this possible, even though the return was on Continental (as ticketed)? What is the general policy in these instances?

Thanks.