I'm a newbie here seeking some help on upgrade strategies for flights from the States to Africa, specifically on several Star Alliance partners -- my question is how to book. I'd be flying United/Continental to Europe connecting to Brussels Airlines or Air France to Yaounde (Cameroon), then on the return using Swiss from Douala (Cameroon). Because I'm trying to use miles to upgrade on all segments across multiple airlines, I have no idea which airline to call to do this booking. Is there a Star Alliance reservations line that can help? I'm a oneworlder but my options for using one world take me from the States to Europe then I'm forced to rely on Star Alliance or Air France. My other option is SkyTeam but that takes me almost all the way it seems except from Europe to NSI, where I have to use Brussels Air (back to StarAlliance).