but it is selective evidence G.
There are a heap of other factors such as previous education standard before training which they have completely ignored.
You just have to look at the editorial team
Editorial Board | The Journal of Aviation Technology & Engineering (JATE) | Purdue University Press Open Access Journals | Purdue University
To see there is a distinct bias towards the big players.
It was the same with that Boeing fantasy sale projection requiring thousands of Pilots.
It was touted and dismissed as bollocks.
6 months later, cry's of there is a pilot shortage according to ICAO.
When you looked at, it wasn't ICAO at all it was a ICAO training conference had decided this and funny enough it was all the people who were hanging their pensions on the Boeing report that were there.
I suspect this paper will be flashed about until someone can be bothered ripping holes in it.