That said, across certain product / service lines, the experience, in the main, is close to homogeneous. Especially amongst carriers of a certain class (the budget airlines often carry the same equipment, numbers of staff on routes, and levels of customer service).
It's probably easier to derive generic figures across different companies for similar products in the airline industry, than it would be for say, the pleasure cruise market, or even regional bus services.

But obviously, that's just a hunch.