I was checking usairways.com for award availabilty between PHL and both OSL and ARN in August 2009. I checked for both Y and C availability. When I checked for C availability, many of the dates appeared as "blank" during August 2009. This surprised me. One would have expected them to appear as either saver C awards or standard C awards, but only a few days had any seats available. Am I doing something wrong or is US Airways planning to use a domestic seating 757 on these routes? Any thoughts?