Activist investor Elliott Investment Management told one of Southwest Airlines' top unions it still wants to replace CEO Robert Jordan, according to a union memo seen by Reuters, even after the carrier pledged to shake up its board.

Elliott Investment Management still wants to replace Southwest Airlines Co. Chief Executive Officer Bob Jordan, according to a union official, suggesting changes the carrier has already promised aren’t enough to satisfy the activist shareholder.

Elliott Management wants Bob Jordan out as Southwest Airlines (NYSE:LUV) CEO and executive chairman Gary Kelly to leave sooner than planned, according to a memo viewed by Reuters. The activist investor told members of the carrier’s top union that despite a board refresh and efforts by Southwest (LUV) to appease Elliott,