hi!
i just took my baby home to canada and back, the time difference being 14 hours behind hk and it's a 16-17 hour flights (2 flights plus layover time) and i breastfeed on take off and landing and asked for the bassinet only after the lights had been dimmed. our flight left around mid afternoon both ways so followed the routine for the day, but woke her up about 5-6 hours later to "start the day" to try to begin the adjustment.
on the flight definately feed breast or bottle on take off and landing to help with equalising pressure. then bring toys for baby to play with and something familiar so they are comfortable. bring a few clothing pegs and 2 blankets (unelss you don't mind using the plane's which i didn't do) one for if baby is cold, the other for covering the basinet. the pegs are to hold the sheet in place. bring ample amount of diapers and extra clothing in case baby soils it or spits up.
as for jetlag, put baby on normal routine but on hk time when arriving. they will wake for the first few nights, i fed my baby for the first 1-2 nights only but make sure no lights are on. then starting from the 3rd night, i'd just sit with her but pat her and sooth her. no talking, no lights. during the day follow your daytime routine. hopefully after a few days they should adjust. my baby slept through by the 5th night on the way there, and then 6th night on the way back.
GOOD LUCK!!!!!!!