This may have been after they started rolling and the 1st officer tried
to question whether they had actually been cleared for take-off.

The big thing is that the words "take-off" can now not be used other
than "cleared for take-off". It may be the case that the Dutch captain
heard the words "cleared" and "take-off" and thought that was his cue
to go.

Paul

"Dave Butler" wrote in message
...
I thought the Tenerife accident happened because the KLM captain suffered
from
excessive self-esteem.