It is worth noting that a Priority Pass membership (which you can get for free from an eligible credit card) will get you into the Air China International First Class Lounge and a credit card like the OCBC VOYAGE Card will get you into the BGS Lounge for free.
There is a First Class and Business Class lounge here but since I was only traveling in the Business Cabin, I was only allowed to the use the Air China International Business Class Lounge.
