Well the ad I'm looking at at the top of this page right now is for direct recruitment to HNA, no agency, and it's says "up to USD348,000 net after taxes".
Looking at the contract details, that amount is advertised as the top of the scale for the "100% Resident" contract option where is says the salary range is $251,000 - $348,000. The break down is (monthly):
Basic: $15,000
Type allowance: $2,000 (for 787/A330 rating)
Base allowance: $500 (based in China)
Housing allowance: $1,500
Safety Bonus: $2,000 (paid every 6 months) - No FDAP hits I guess
global medical/dental/optical coverage for family
International school fees for 2 kids
3-5 roundtrip tickets per family member per year.
$20,000 bonus for renewing contract after 3 years.
$300/hour OT for hours over 960/year
So it looks the the cash part of your salary if you're 787/A330 rated and don't have any FDAP hits will be $252,000/year, which is the minimum specified above. Any extra will come from the insurance/schooling/tickets value.
2 kids at international school is probably ~$30-40,000 and a good global expat insurance plan for a family of 4 would be ~$15-20,000
Throw in the cost of 3-5 full fare round trip tickets per year for your family and I guess it's getting pretty close to $348,000 in total value