News How did it happen? NTSB begins probe of midair collision of Alaska floatplanes that killed 6 people May 15, 2019Kristin Lam, USA TODAYComments Off on How did it happen? NTSB begins probe of midair collision of Alaska floatplanes that killed 6 people On the same day the death toll from a floatplane collision in Alaska rose to 6, the NTSB launched what's expected to be a week-long investigation.