Thanks a lot estam127 and Aviatrix for you quick response !

Since I wrote my post, I tried to talk some sense out of me. The thought of us being upgrade to two seats in business class even crossed my mind. After a good night of sleep I will call KLM tomorrow to have information about seats.

As for the Montreal-Amsterdam flight being late, Here is what I saw on Flightware for the past couple of days. This flight is scheduled at 6 h 25 PM
August 30 : 6 h 40
August 29 : 7 h 07
August 28 : 6 h 50
August 27 : 6 h 46

Believe me, I love airplanes but just before take-off I'm sure I'm gonna die. And I'm flying in a MD-11. That was my first nightmare. I can't help it, I will be very nervous until I arrive, after two flights, alive in Berlin.