Hawaiian Airlines: standard pitch is 31", Extra Comfort offers 37".
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Standard economy seat pitch on Hawaiian Airlines is 31 inches.
Extra Comfort is especially worth it on Hawaiian's longer transpacific routes, given the extended flight times.
Yes — pitch can vary by aircraft type and specific route even within the same fare class, so always check a seat-map site for your exact flight number before booking.
Exit rows and bulkhead seats often have similar or better legroom than the paid premium option, sometimes for a lower seat-selection fee — check the seat map before paying for the named premium product.