Does AAL, including eagle fly 36x a day between MIA-FLL or Mia and anywhere? I don't think so. The other thing is Eagle is a subsidiary as is Republic, American Connection and Skywest. Thing is, they are all considered separate airlines....not all as one. Sure, AA sets/requests routes and fares but in the best interest for themselves and for the minimal interest of keeping their subsidiaries happy by just letting them make enough money. That in mind.....this game has worlds in which you can run more than airline but makes you manage them separately, not as part of a 2500 strong fleet making 1Trillion in profit (that's real?). If we are airline lovers, isn't the challenge of getting my airline past the start up and into profitability and realistic challenges from competitors the fun part. Failure is part of that challenge. AND, since the game is free....it's ok to fail and jump right back on the horse and even more fun if you succeed.
Yes, part of the fun is the challenge. Especially seasoned players impose extra challenges on themselves. Beginning players otoh usually aim for maximum profit. And it's not so easy to become top 3 of the airline worth list, even if you want to.
And yes, 1 trillion profit is absurd. I wouldn't even know what to domwith so much money; you could buy entire countires for that.
Regardin the subsidiaries: In RL those subsidiaries do the regional point to point, small spoke to hub and longhaul feeder flying with aircraft <100 pax. In AE we cannot have subsidiaries, so we have to operate the smaller aircraft ourselves to get those services.
To avoid so high frequencies perhaps one could raise gate & terminal costs at bigger airports. And, while 37x daily is extreme, AAL flies 10x daily MIA-DFW and UAL 15x daily EWR-ORD / -SFO.
What one could do to avoid such problems, is to create "hard" worlds for realistic style airlines (kinda S2 style + other hardships) and "easy" worlds for huge airlines.