Elliott Investment Management launched a podcast to influence Southwest Airlines shareholders.AaronP/Bauer-Griffin/GC ImagesElliott Investment Management launched a podcast to influence Southwest Airlines shareholders.The activist investor holds 11% of Southwest and is seeking a top-level shake-up.Podcasts offer cheaper, controlled communication that have the potential to reach retail investors.Last week, activist firm Elliott Investment Management launched a podcast as part of its efforts to influence Southwest Airlines shareholders.Elliott, which built an 11% stake in the US airline, has called for a new CEO and board members.