FILE - Southwest Airlines Boeing 737 lands at Manchester Boston Regional Airport, June 2, 2023, in Manchester, N.H. Southwest Airlines has adopted a ‘poison pill’ following activist investor Elliott Investment Management taking a significant stake in the company. The airline said Wednesday, July 3, 2024, that the shareholder rights plan is effective immediately and expires in a year. For any extension to occur, Southwest shareholders would need to give prior approval.(AP Photo/Charles Krupa, File)