Has anyone purchased a case for your bicycle for airline travel? Did a quick search and did not find anything...

They are VERY expensive and am unsure exactly what I should be looking for other than a hard case with wheels. I have traveled with my bike packed in a cardboard bike box, but need something more durable. Although, I like the idea of putting a bike box in the recycling bin rather than finding storage space for a bike case...

This case is for travel to Europe by plane, train, and ferry!

Thanks for any advice you can share.
sarah