What was your daily pax level? In my opinion, while you can start to feel the effects with just a few hundred thousand, you really need > 1m daily pax. Also only 4 hubs aint much. Try 40. Hub EVERY airport you fly to/from. I general only focus on green pax at standard capacities & prices till I get to this sort of level. Then I go nuts. It takes a lot of planes & a lot of time. Good luck.
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