I was due to fly with United Airlines via Chicago, but the inbound flight from Chicago to Ottawa was delayed by thunderstorms in Chicago, and its estimated time of arrival kept getting later and later. Whatever, it was making the likelihood of making my connection to Vegas a little less than certain, so when offered a US airways flight via Philadelphia instead, I said, "Sure, why not...?" I will get in to Las Vegas around 50 minutes later at around 11 PM local time, but at least I should make it today... This is important not just because I'd like to get some sleep today, but also because I have a day-trip to the Grand Canyon booked for tomorrow, with a pickup at my hotel at a rather unfriendly 5.50 AM!
As I am typing this, they just announced that the United flight is arriving shortly, only 30 minutes late, so it would have been OK after all. Oh well...