I think they met on Cliton’s plane for that reason. Having said that I am sure he recorded the conversation for future extortion threats to Lynch - she is stupid beyond belief as she was betting PIAPS is going to win. If DT wins he may go after her by subpoenaing that tape.
They didn’t meet on Clinton’s plane, nor Lynch’s plane.
They met on a separate plane that was parked and EMPTY.
They wanted NO recordings and NO other people on that plane when they met.