Originally Posted by
HadesNL
Bear in mind that a flight over 12/13 hrs becomes ultra long haul and will impact the crew's working hours and rest times. If a flight gets delayed, it will be easier to reach the maximum stretch of crew operating hours which can give complications in rotations and staffing. ( on a side note maybe the FA union negotiated the stop in SIN as a well earned perk of the job

)
For that reason airlines have two sets of crew and special rest beds for the resting crew on flights longer than 8 hours ?
However, SQ has flights of 17 hrs duration (LAX-SIN and EWR-SIN) , look in the table 'longest flights' of
this page .
Do they have three sets of crew on these flights ?