NWAviator

It's because they aren't part of China.

Hong Kong is China now (kind of), Macau isn't though.

I'm pretty sure both Macau and Hong Kong are special administrative regions of China.

Bombardier Dash 8 Q400 NG - Short haul routes

Boeing 737 Max 7 - Short/medium haul routes

Boeing 737 Max 8 - Higher demand short/medium haul routes

Boeing 737 Max 9 - Medium haul international routes

Boeing 787-9 - Long haul international routes

Boeing 777-9X - Busy long haul international routes

For long haul aircraft, because there are less total cycles being put onto the airframe, upwards of 16 hours should be fine. I keep shorthaul anywhere between 9 and 12 hours daily because there are more cycles being put onto the airframe. 

Thank you! I'll keep that in mind.

Is 16 hours fairly realistic?

1, I would definitely recommend FSX over FS9. However, you should consider getting either Lockheed Martin's Prepar3d (which is essentially FSX with better graphics and bug fixes), FSX: Steam Edition (which is a bug-fixed version of boxed FSX) or X-Plane 10 (which I'd recommend least out of all of them if you're going for a truly immersive, in depth experience).

2, 4GB of ram would definitely be enough to run any sim on fairly low settings.

3, The base product is fairly realistic; if you're willing to spend some money to get a good payware addon (A2A and PMDG produce AMAZING products) it can be unbelievably realistic. 

4, For me, at least, it's very fun.

5, In FSX you can get a large number of freeware and payware planes.

6, No idea.

7, No idea.

8, Boxed FSX no longer has multiplayer, but FSX: Steam Edition has multiplayer.

9, I think there are around 25 or 30 thousand. I might be totally wrong though.

10, The more addons you get, the more indepth it can be. For example, it can take weeks or even months to master flying a PMDG aircraft based on your previous level of knowledge.

11, That's your choice.