For the last 4 years on American and Delta I have traveled with hard case double ski
http://www.sportube.com without any problems. They ask if there is one pair of skis and I always say yes.

They never check.
The important part is the double ski bag must be under 50LBS. I bring a hand held digital luggage scale just to be sure its under 50lbs. That scale was a great investment.
My only check in bag was my one double hard case Sportube.
Last year I traveled Delta. I had two skis in the double Sportube which comes to 35 LBS for my skis/poles. Add another 14 LBS of clothes for good padding and you got 49LBS. My only other bag is a carry on bag which has my ski boots, helmet, ski pants, goggles, gloves, base layer, shampoo, shaving, etc. If the airlines loose my check in ski bag for a few days, I still have everything I need to ski with my ski boots for a few days by renting only skis and poles. I also wear both outer and liner jackets on the plane.
Edited by catskills - 11/13/09 at 5:08am