MESA air is way up — what’s going on?

MESA is up more than 100% since a Dec 27 $1.02 low. Anybody know what's going on? Earnings on 12/27 were terrible. I've googled around and can't find anything. (My position: 1500 shares long-term; just added 3500 more when it dropped to $1.30 on Dec 12.)

Thanks