are there any pay scale differences between expatriates and locals?
Only one pay scale for all nationalities. As to the pay rate of the FO's im not sure.
Shaman, a few have asked about 50-75% Commands, the reply is "we dont do that" Its Singapore, you are expected to work ALL of the time.
As it stands you are entitled to get 8-9 days off a month, Night flights, vary but it can be as many as 1 a week, though more usually its 1 every 2 weeks. You'd be unlucky to get more than 3 Night flights in a Month, as they have to give you more days off for them.