Anchorage is probably my most desired airport so I’d like to add a few things to this, namely that if Ted Stevens International Airport is added, it should also feature Lake Hood Seaplane Base (LHD) in addition to the main airport. It makes sense to combine these as they are attached through Taxiway V.
For the sake of brevity, I’ll only add to the previous post.
4 - Water / Skiplane Strip Is E/W; length is 4540
5 -

Airlines: Regal Air (Charter, base), Alaska Seaplanes (Charter, utilization)
6 - (I won’t do 20, since I propose this Is only part of an Anchorage airport addition)
Bethel Seaplane Base, Akutan Seaplane Base, Zachary Bay Seaplane Base, Alitak Seaplane Base, Excursion Inlet Seaplane Base, Tenakee Seaplane Base, Sitka Seaplane Outlet
7 - I think, while new airports are always welcome, increasing the variety of ways to play will keep us returning to airports again and again, and adding Seaplanes gives us a really unique experience with the airport. In addition, being the largest seaplane base in the world (190 flights per day), it makes sense to introduce this feature with something like this! It also gives a new feature in Charter planes, which could be a potential interesting mechanic / addition. So if the seaplanes get implemented with the airport being primarily cargo, it not only extends the cargo experience, but adds something new.