impact the boeing shares. >> eight percent down from one stock in a morning is a big drop. alison kosik, thanks very much. cnn business editor at large richard quest joins me now. he knows a thing or two about flying. tell us, richard, in your long history covering the airlines how unusual is it to have two planes like this so close to each other to have an accident? we don't know the cause, but at such a similar time in the flight how concerning that should be. >> reporter: the difference between this and the dream liner 787 incidents, there you have a new plane that had problems, fires kept breaking out. nobody died and the planes didn't crash. you had to go back to the 1950s and the comet which is a british plane. the british built this jet and it kept blowing up and falling out of the sky.