Southwest Airlines Community

Southwest says "Each aircraft is equipped with a sophisticated air distribution system that introduces fresh, outdoor air and HEPA filtered air into the cabin every second while inflight, resulting in exchange of cabin air every two to three minutes.", which says the HEPA filters are working great in flight, but they don't detail what's happening on the ground.   If I have an itinerary that calls for a no-plane-change layover, are the HEPA filters still exchanging the cabin air every two to three minutes while the plane is on the ground for deplaning, cleaning and boarding?   This article from a year ago implies that Southwest isn't running the HEPA filters at 2-3 min recirculating intervals while on the ground, but it's a year old and not very clear.   Would love some guidance on what air filtration looks like while the plane is on the ground in between flights, thanks! ... View more