it's usually 200 rmb each way, which is some 30$ or so. your fare is 600 rmb ai, so I'll guess that either you got a very very decent SH - BJ fare or you're flying to a nearby city.

the fees are especially annoying when i want to use a connection and it requires double taxes and fees.

i keep wanting to try out spring, but the taxes don't quite make it cheap enough. Tsn-Sha is around 300 and fees, but i can grab a train for same price or a real airline for 100 more with real luggage allowance