It's more "Planes are new and unproven and if you want to ship cargo on them I'm going to want to see numbers". In fact this did eventually work, but not until FedEx came along half a century later using surplus early generation jets that no one was imagining in the early part of the century.

Someone who threw a ton of venture cash at "Air Freight Ltd." in 1913 or whatever would have lost their shirt.

Back to the point: I'm not saying this won't work. I'm saying that there are firm limits to how well it MUST work just to be better than technology that was proven out five millenia ago. That's a really high bar, and it needs numbers and not press hits.