World Former NTSB chief: Hundreds of Boeing jets should be grounded in wake of Ethiopia crash March 11, 2019John Bacon and Bart Jansen, USA TODAYComments Off on Former NTSB chief: Hundreds of Boeing jets should be grounded in wake of Ethiopia crash More than a dozen airlines grounded some of Boeing's newest jets, the Max 8, as investigators probed an Ethiopian Airlines crash that killed 157.