Hola Maui -
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I have a secret place to find almost anything.
It spells GOOGLE. Golf Oscar Oscar Golf Lima Echo.
Do not tell anyone about this...
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After you get Google, type FAA AIM, it comes in PDF.
FAA Airman Information Manual
Then go to Airspace. Chapter 3-2-2.
Class A Airspace.
Under "a. Definitions", it says
12 (statute) miles from the coast.
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Please, do not tell anyone about Google. Only few know.
I fear that Osama would find out about it.
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Happy contrails