The 4 hour delay in the morning (AC702) was due to a mechanical problem with the aircraft, not because of the weather. I missed some very important meetings because of this.
The evening flight back to YYZ was delayed because of the weather and I knew that this could have happened when I booked the flight and saw the weather warning. So I am not complaining about that. Just wanted to check what the policy is for delays over 4 hours which were caused by AC.
By the way, I wish I could have enjoyed "the delights" of the LGA RCC a bit longer because they closed at 8pm so they kicked everyone out.