What's sad is that Airlines aren't legally bound to make accomodations or protect you on other carriers when their own aircraft can't operate due to mechanicals, weather, etc. Based on the experience of 2 families members being delayed 2 days to/from SEA due to the fog here in SEA, I have lost a lot of faith in Horizon Air. They messed up big time. Luckily, I flew Delta, and was delayed 10 minutes when I left SEA.