Hawaiian Holdings (NASDAQ: HA) shares rallied 6.1% in the last trading session to close at $13.80. This move can be attributable to notable volume with a higher number of shares being traded than in a typical session. This compares to the stock's 2.2% loss over the past four weeks. Shares of Hawaiian Holdings have been gaining over the last few trading days as investors await the U.S. Department of Justice's ("DOJ") decision on HA's planned merger with Alaska Air (NYSE: ALK). This parent company of Hawaiian Airlines is expected to post quarterly ...