The passengers were leaving the plane after landing, and one smiling, satisfied passenger paused to congratulate the flight attendant.
"Stewardess," he said happily, "I want to compliment you and the crew and especially the captain for getting here right on time. It's not often that an airline gets to where it's going exactly when they claim it will. I'm going to call your home office and let them know how pleased I am."
"Why, thank you, sir," the flight attendant answered, "but I think you should know--this is yesterday's flight."