Cathay Pacific used to request (and pay for) a 15 knot tailwind Flight Manual supplement for all their aircraft when operating at Kai Tak however they were only interested in the take off performance data as a significantly greater payload could be carried off runway 13 with a 15KT tailwind compared to using runway 31 with all its obstacle related limitations in a 15KT headwind (several tons of payload on a 747). There were some visually hair raising take offs from some foreign operators using runway 31 simply because it was the active runway according to wind direction when CX would take a lengthy hold for a take off slot on runway 13 on the same day in the same conditions. Some UAL DC10-30 take off's come to mind during the period after UAL took over Panam's transpacific operation but they were not alone.