Except the devs have explicitly stated that this is a tycoon game, not a simulator.
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That being said, I still wish for more depth in the management aspect. But as andy mentioned, rather than having multiple price points for airlines, I’d find it’s better to make higher stars have additional requirements, e.g. automated bag drops, ticket/sales office, lounges, etc. That being said, at the current implementation, higher star airline already brings in potentially higher revenue on account of them bringing in larger planes than lower star ones, which can pack in more pax.