Kermadec
In a common-sensical approach, I've tagged the southern runway as abandoned and the northern one as disused (the latter to suggest it might be re-used for certain events such as the yearly festival.
But I only did this on searching the internet for any fresh information. According to the website of the  museum it is going to be re-developed in the coming years.
That might include the runway(s), and up to then the updated tagging will do I suppose. I close the clue on account of having deleted misleading information.
Feel free to re-open if you disagree.