Celebrity Cruises' yields are now moving above those of sister Royal Caribbean, Richard Fain, Royal Caribbean Cruises Ltd.'s chairman and Dan Hanrahan, Celebrity's president, told financial analysts during a quarterly earnings call Friday. That's a big achievement considering that for several years Celebrity, considered a premium product, was underperforming in pricing when compared to its contemporary sister brand, Royal Caribbean. Officials said the yield improvement began last year, is continuing into this year, and that Europe and Alaska are performing well. In addition, Panama Canal yields are up, as are yields for Hawaii and South American cruises. Good itinerary planning has been one reason, Hanrahan said.