These rituals can be remarkably specific. Georgia Hopkins, a freelance travel writer, only sits in odd-numbered rows: 11A ideally, or 13A/15A if that’s taken. Rows 12 or 14 simply don’t exist in her world. “I can’t do even numbers. If not 11, I have to sit in an odd-numbered row,” she said. She also insists on a window seat as far forward as possible, so she boards earlier, exits faster and is served first.