See, studies are not there to show something is true. They are there to have a scientifically proven analysis as a base.

It’s like when you are at work and everyone knows that meeting xy is inefficient. However, your boss still needs data and a slide deck to present hard facts to the management board.

I understand why you write this, but collecting data is the first step when you want to change something.

Even if a femomenon sounds obvious, maybe it is not. Moreover the study analyses also why this happens, and it is pretty interesting.

Which is cheaper:

• lift 50 tons of metal off the ground burning 20,000 liters of fuel
• make 50 tons of metal run over the ground using electricity

How is this obvious?

In order to find out the intricacies of WHY, yes.

For cross border routes only 45.9% were always cheaper by plane and for domestic ones only 15.2%.