Key TakeawaysShares of Hawaiian Holdings rose Wednesday after the Hawaiian Airlines parent agreed to extend the U.S. Department of Justice's review period of its proposed acquisition by Alaska Air Group.The review period for the $1.9 billion deal was originally set to expire earlier this month, and has so far received two extensions, with the new deadline set for 12:01 a.m. ET Friday.Regulators have ramped up antitrust investigations into the airline industry recently, with DOJ lawsuits leading JetBlue and ...