[Fomite]

And yet a number of "First/Business Class Only" airlines have failed.

[zone411]

But most of them failed because a jump in oil prices in 2006-2014. We're below these levels now.

[Fomite]

For the moment. I don't know that I'd want to build a business - and certainly not an aircraft production line - on the assumption that oil will remain this cheap.

[zone411]

What airlines often do if they are worried about this is to hedge through oil futures.