Originally Posted by Kiwi Flyer
Yes. Some airlines have issue with same route twice but it is in the rules.
As mentioned before SFO-SIN is preferable in some circumstances (eg uses up only 1 of the 24 coupons and less mileage towards the limit).
All points fully valid.
But it will not optimize your PPS sector count if you are into that
If you are into that and make split segments - you might need to make the connecting leg on SQ 1 from HKG to SIN as an open booking - because SQ will otherwise make one segment of it. Just book your seat in a seperate booking in the correct class to ensure your seat on the contimued flight.
Cheers
Thomas