We've all been there before. Just this week I was booking tickets on an Air Canada flight for myself and two coworkers. We were deciding between a Monday night or Tuesday morning option and went with the latter so I was surprised when my phone buzzed with a calendar alert for the flight a full day early. Turned out I booked us on the wrong flight after having switched the dates back and forth a few times while booking. Without my phone buzzing I wouldn't have noticed until well after that initial flight took off without us.