Several years ago, we flew from SF to Seattle to take a same-day Alaskan cruise. My mother and aunt got to the busy airport too late, and missed the flight, and were fortunate enough to get seats on a later flight! I had to stay at the Seattle airport to accompany them to the boat. Very stressful! Not a good way to start.
This past summer, we were booked on a very expensive bus tour in Alaska. Having learned our lesson from the cruise, we arrived a day early to make sure that we would not miss it. It turns out that another party in the tour was very late and held up 3 busloads of eager tourists! It caused our tour that day to be very hurried.