By Bret Kenwell JetBlue stock is under pressure amid its hostile bid for Spirit Airlines. Here are the key levels to know now. The airline space is making today a Merger Monday. Or at least, it’s trying to. JetBlue (JBLU) – Get JetBlue Airways Corporation Report shares are trading lower on the day, down about 4% after making a hostile takeover bid for Spirit Airlines (SAVE) – Get Spirit Airlines, Inc. Report at $30 a share. For its part, Spirit stock is up about 12% on the day. The deal is an all-cash offer, which is nice for investors as it does not over-complicate matters like an all-stock d…