Selection about the alternative aerodrome
I am working in ZBAA as an approach controller ,last week we have a strong windy day ,so many aircrafts go around due to strong cross wind .An A330 which departed from HongKong had gone around twice ,when we ask his intention ,he said he wish to hold at somewhere and hope the wind could become weak ,but unfortunately ,the wind was still strong , and the aircraft had been holding for nealy 45 minutes ,but at last ,to our surprise ,he decided to alternative to ZSPD ,an aerodrome about 2 hours from ZBAA ,and according to the flihgt plan we can found from our system , his alternative aerodrome is ZBTJ which is only 20minutes away from ZBAA ,can anyone tell me why ?
And another question ,why a aircraft bring that much fuel ? He still can fly about 3 hours after he departed from HongKong ,if no strong wind that day ,I think he could be overweight ?