Pearson's Twitter has been mentioning a "software problem" with check in (sounds like just kiosks, but maybe staffed positions too?), and says they're working on it.

Oh.... and apparently they're taking diversions due to ground stops at Ottawa and Montreal. Just six so far, but wow.

Print your boarding passes online, and hopefully things will be as normal as possible.

Rain pouring into terminals notwithstanding.

It's times like this that I really hate that you can't use an electronic boarding pass for so many flights.