a string of air show disasters. in september 2011, ten bystanders and the pilot were killed in this crash at the reno nevada air races. debris flying into the crowd. in 2013, a wind walker and her pilot died in this fiery crash. and in 1988, 70 were killed, and hundreds injured in ramstine, germany, when this stunt went terribly wrong. as this latest investigation gets under way, it has many asking are air shows too dangerous. what is the audience looking for? they re looking for thrills. oh, my goodness, how are they going to pull out of that. and sometimes they don t. reporter: there was a moment of silence this morning to remember those killed. and today s session of the air show has been canceled. understandably so. thank you so much, kristen dahlgren. vice president biden has generated a lot of talk after yesterday s meeting with