Sheepy: like i said earlier, this defeats the purpose of an OPEN world and makes it unfair if someone say wants to fly to a particular airport, but cant because its too used, i think 3 small 100 airline worlds is the best way of reducing congestion without restricting players.
adityapratama: this concept is mostly inded for open worlds, as there my favorite at the time, i really think ar and sheepy's suggestions impose too much restrictions, especialy for an open world, or even a real world, making there restriction more for appropriate for a special world.
limiting airlines wont mae them fight only in the biggest airport, because if they concentrate there, theoretically they MIGHT become just as crowded as now and it might reduce crowding there, as what are the chances of every airline starting in the same airport? this may force some into smaller airports as well, unpopular airports will still be used, especially by someone like me that likes wide variety of destinations, and maybe someone wanting to fly a regional airline.
i really think this idea should be given a chance instead of brushed to the side, it hurts no one, and appeals more to those wanting to avoid the overcrowding.
My suggestion is intended for realistic worlds, however I had to say it when the country limit appeared.
Open worlds are meh anyway. Simply limiting airlines would not work in open, imo.
Realistic is much better, don't have Air New Zealand running JFK-SLC and GRU-LIM at the same time.