One time way before the merger, I was in Jackson Hole airport. There were 3 planes parked side by side boarding at the same time, 1 Delta, 1 United and 1Continental. As I was a greater, a woman came up the stair with her 2 kids I asked to see the boarding passes and she presented 3 boarding passes for the continental flight. I told her that she got on the wrong plane as the continental plane is right next door. They rush off the staircase and the continental plane began to push. Poor lady. Don't know what happened to her after that.