Port holes are 12" dia and airports are 16" dia.
They are about 5' 3'' up from the deck
The Floating Drydock's "USS Missouri Plan book" can tell you where the portholes and airports are located for a WWII Iowa.
-From The Floating Drydock-
USS MISSOURI BB63 PLAN eBOOK
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The officers wardroom is one location that has the airports.
There are a couple of others but it varies from ship to ship and the time frame of the ship.
There are also a couple of armored airports in several areas.
Also look here at Calling all Ship Fans thread.
viewtopic.php?f=47&t=4683
There is a lot of info on these ship there.
James