Quite a few smaller cities offer subsidies to carriers to bring traffic to their cities. Those same cities might not be happy when travelers use the subsidies to go to the big hub for cheaper and instead. It might even be contractually agreed that the carrier has to make sure they go where they're supposed to, thus the rules we see.
Quite a few smaller cities offer subsidies to carriers to bring traffic to their cities. Those same cities might not be happy when travelers use the subsidies to go to the big hub for cheaper and instead. It might even be contractually agreed that the carrier has to make sure they go where they're supposed to, thus the rules we see.