Reported to be N8668A (reg not visible on videos) On takeoff right hand eng#2 right hand aft cowl door came loose first, opened and flapping around … pilots only know after CCW and pax report…pilots think inner flap hit … return for overweight and no flaps landing, fuel 22.9 with 6 crew and 135+2 pax … change from rwy 25 to 26 then 34L …on landing left hand cowl visibly opened too… both doors flapping around and shredding, only small pieces remain…