Court records still show the case at the Nevada District Court for some reason and I can't find any petition or notice of removal.
Nevertheless, removal implies there have been monetary discussions between the Captain and Allegiant (e.g., before the case was filed). Diversity requires the damages more than $75,000 -- a very low bar in this case -- but as a matter of routine State filings only specify "more than $10,000" which by itself is not sufficient for removal.