Smooth Boarding and friendly crew. Regrettably when we boarded the unit that provides air circulation failed. The pilot educated us and requested routine maintenance specialists to test it out. Delta was seriously very good about currently being clear with why we ended up delayed it’s just that’s the airplane was https://www.diigo.com/item/note/b7ses/sao4?k=43525516991a572dc4bd535d74a8ef4c