Since the MNL official website is next to useless, I've cobbled together an improvised UNOFFICIAL portal that gathers the separate MNL-related posts I've written over the past couple of years. Sharing it here in case it's of interest or help to anyone using this airport:

https://ittekuru.com/naia-airport-guide/

Here's a detailed overview page that also links to my various MNL-related reports:

https://ittekuru.com/2020/01/11/airp...a-philippines/

A few caveats and various odds-and-ends.
- As a resident of Greater Manila, I've never transferred between flights at MNL since it's effectively my home airport (either my point of origin or final destination). As such, I've not been able to write at length about flight connections. One of the pages in the guide collects the information that I've been able to suss out regarding connecting flights at MNL, but none of it is based on direct experience.
- I very rarely travel within the Philippines so the guide is rather weak on domestic flight information. I've had a recent local trip out of T3 so that's covered, but the domestic wing of T2 and the all-domestic T4 aren't covered at all.
- I plan to keep these guides (especially the individual terminal reports) up to date as much as possible, either from personal experience or from official/reliable sources, but needless to say it won't be possible to ensure that every detail is accurate or current.

Cheers.