The secret is that you can drop/collect people at the silver parking zone for free, and there's a shuttle to the airport which is quite frequent and short. But

The secret is that you can drop/collect people at the silver parking zone for free, and there's a shuttle to the airport which is quite frequent and short. But I agree, trying to extract money from people like this is greedy and dangerous. My experience of the airport flyer has not been at all good.