I think in some cases there are way too many gates (and therefor slots) available at many of the airports. For example, small regional airports that in reality have 4 to 6 gates, in some cases have 25-50. To set these more accurately would also affect what happens at major airports, and keep some elements of competition in all markets.
An example... Terre Haute, IN (HUF) is an airport I'm familiar with. The real-world terminal has 2 gates and has not had passenger service in almost a decade. In-game, this airport has 25 gates! As it stands, if there is an abundance of gates at all aiports, the "big guys" will always be able to come in and take over. Smaller regional carriers potentially wouldn't stand a chance. If someone wanted to make their favorite small airport into a major hub, exercise an option to build additional gates/terminals.
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