I'm in favor of this.
Since we can't change how AE works I think a way of doing this would be by creating a world that does only allow real world airlines, however, while also removing political restrictions (which will allow fifth freedom routes), but enforcing terminal and gate leasement restrictions. Let's say 10 hubs only and only 5 terminals and else a max of 5 gates in ones country and 2 or 3 gates in other countries.
This would allow Routes like the old PanAm Around the World route or fifth freedom flights from Europe to Australia via Singapore for example.
The rule would be that spamlines wouldn't be allowed in the world and that a realistic approach to building the airlines is encouraged. It'd work on a the principle of good faith that players will follow the rules, but if there is a suspected person we could present the case to a moderator or a gremium which would decide on a case to case basis if the accusations are warranted and then remove and block said player from this world.
On the other hand we could also create a world to which you'd have to be admitted in to.
All this addition of the world would do is create another world for players that would like to have a more realistic approach to the game, while not banning anybody from the already existing ones.