An interior ceiling panel system for aircraft, the aircraft including an aircraft passenger cabin having aircraft cabin passenger seating and a ceiling area having first and second sides (16, 18), the interior ceiling panel system comprising: a ceiling panel having first and second side edges (40, 55), said first side edge of said ceiling panel being configured to be disposed in the first side of the ceiling area, and the second side edge of the ceiling panel being configured to be disposed in the second side of the ceiling area; an airflow directing panel configured to be mounted in the second side of the ceiling area of the aircraft passenger cabin, the airflow directing panel including a first panel portion having a first edge and an opposing second edge, the first panel portion of the airflow directing panel and the second side edge of the ceiling panel defining an eddy space adjacent to the second edge of the first panel portion of the airflow directing panel and the ceiling panel; an airflow supply source configured to be disposed in the first side of the ceiling area, said airflow supply source being configured for introducing airflow into the ceiling area of the aircraft passenger cabin, said airflow directing panel providing an obstruction at the second side of the ceiling area opposite from said airflow supply source, whereby introduction of airflow through the airflow supply source to the eddy space creates an eddy in said eddy space that thoroughly mixes incoming airflow with air in the aircraft passenger cabin, and the ceiling panel and eddy redirect the incoming airflow downward toward the seated passengers, diffusing the incoming airflow in the air in the aircraft passenger cabin to prevent unwanted drafts in the aircraft passenger cabin; and an overhead stowage bin configured to be in the second side of the ceiling area; wherein said airflow directing panel is disposed between said second side edge of the ceiling panel and said overhead stowage bin. a ceiling panel having first and second side edges (40, 55), said first side edge of said ceiling panel being configured to be disposed in the first side of the ceiling area, and the second side edge of the ceiling panel being configured to be disposed in the second side of the ceiling area; an airflow directing panel configured to be mounted in the second side of the ceiling area of the aircraft passenger cabin, the airflow directing panel including a first panel portion having a first edge and an opposing second edge, the first panel portion of the airflow directing panel and the second side edge of the ceiling panel defining an eddy space adjacent to the second edge of the first panel portion of the airflow directing panel and the ceiling panel; an airflow supply source configured to be disposed in the first side of the ceiling area, said airflow supply source being configured for introducing airflow into the ceiling area of the aircraft passenger cabin, said airflow directing panel providing an obstruction at the second side of the ceiling area opposite from said airflow supply source, whereby introduction of airflow through the airflow supply source to the eddy space creates an eddy in said eddy space that thoroughly mixes incoming airflow with air in the aircraft passenger cabin, and the ceiling panel and eddy redirect the incoming airflow downward toward the seated passengers, diffusing the incoming airflow in the air in the aircraft passenger cabin to prevent unwanted drafts in the aircraft passenger cabin; and an overhead stowage bin configured to be in the second side of the ceiling area; wherein said airflow directing panel is disposed between said second side edge of the ceiling panel and said overhead stowage bin.