On November 24, 1971, a man who identified himself as Dan Cooper bought a one-way ticket from Portland to Seattle on Northwest Orient Airlines flight #305. He paid for his ticket in cash and made his way to seat 18C.
Shortly after take-off, he summoned one of the flight attendants, Florence Schaffner, to his seat. He handed her a piece of paper. The flight attendant, believing it to be a phone number or a pick-up line, slid the note into her pocket. But the man leaned forward. “Miss,” he said. “You’d better look at that note. I have a bomb.”