Miraculously everyone on board survived.
Investigators are still in the process of identifying other victims and notifying next of kin.
"This was planned, this was deliberate, and it was done over an extended period of time," Martin Dolan said.
That doesn't mean 2018 will be the same.
Richard Cousins, CEO of Compass Group, and four of his close family members were among the six who died when their seaplane crashed into a river.
The crash occurred when the small plane landed short of an airport runway.
Investigators said co-pilot Andreas Lubitz, suspected of deliberately crashing a plane in the French Alps in March, practiced entering the fatal descent settings the same day as the crash.
As many as 28 people appeared to have survived the crash after the plane crashed.