Sheri, on the USAirways website you can find the mileage required between all continents to redeem free tickets here: http://www.usairways.com/dividendmiles/redeemingmiles/star_alliance_award_chart_060104.pdf. The FAQ's on Star Aliance website say that with a couple of exeptions you can't upgrade on other airlines. But with USAirways I think you can upgrade to biz class on USAirways "partner" airlines, (I think I have done this before) but you have to take the same airline both ways across the Atlantic. All the Star Alliance affiliates are not "partners", however.