A skateboard can be taken on as a carry on item. I have added the policy for your reference:
Skateboard, may be substituted for a carryon or a checked bag. If the skateboard fits under the seat, it does not need to be in a bag or covered, but it does have to be stowed with the wheels up so that it doesn't roll. If stowed in an overhead bin, a skateboard must be stowed with the wheels up and needs to be in a bag or have the wheels covered (trash bag is acceptable) so as not to damage other articles.
I hope this information helps
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