the Braves are boarding the plane to SD.
The Mets are not going to leave Milwaukee, travel to Atlanta, and all for the chance to go fly to San Diego when they could have just stayed in Atlanta.
Even if the Mets were to inexplicably want to play those games (they won't if they've clinched), Atlanta would just say, "No thanks, we forfeit. Have fun in San Diego, but we're already on the plane and just told he pilot to divert to Milwaukee."