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This question already has an answer here:

ARTCC does air traffic control to the flights in their FIR. Then who does air traffic control to flights that are above the ocean(like pacific ocean or atlantic ocean)? Is there any FIR above the ocean too? I want to know that what facility does air traffic control to the flights above the ocean. Please let me know in detail. Thank you.

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marked as duplicate by RedGrittyBrick, Pondlife, SMS von der Tann, CGCampbell, Koyovis Oct 23 '17 at 21:52

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.