Snowballs
The Boeing standard tail wind limit is 10 knots however airlines can pay additional money to increase the limit to 15 knots. All QF B747's and B767's (possibly the B737's as well) have had the limit increased. It would obviously be worthwhile for any carrier operating into SYD using one of the limited number of pre - curfew slots to have the higher tailwind limit.
Dan
QF policy is that the services that have approval to land in SYD prior to 0600lt have to arrive with sufficient fuel to hold to 0600 in case of weather conditions being outside limits to land on 34L. I believe that if SQ are not carrying this additional fuel then they are in breach of the conditions that were defined when they were offered a pre 0600 slot.
Ausatco - Great post, thanks for the gen.
GB