[kjaftaedi]

Your analogy is slightly better, but even then it still misses the whole idea of hubs and connecting flights, because it's not just your trip to the beach, it's a whole network of cars trips to the beach that also depend on your trip to the beach in order for the system to function.

Once you start removing trips and other people take your parking spot, you don't always get your parking spot back or even one close, sometimes you might have to find all your cars a new beach to use.

[quantified]

You may find reasons to favor yourself, of course. But if you’re just diddling around not making use of your slots, and someone else can be, the greater good is served by opening up the spot for someone else.