I had spent months preparing my six-year-old daughter, Emma, for her first airplane ride. Because she has autism, familiar routines help her handle unfamiliar situations, so I packed everything that made her feel safe: her favorite snacks, headphones, coloring books, stuffed airplane, and the window seat she had been dreaming about for months. The trip was supposed to be simple—four days at the beach, just the two of us. It had been two years since her father, Sean, passed away, and I wanted to give her a happy memory she could keep.

But when we boarded the plane, my heart sank. A woman was already sitting in Emma’s carefully reserved seat, 7A. I politely showed her our boarding pass, but she insisted she had paid for the window. Then flight attendant Lisa checked the tickets and discovered that an aircraft change had caused an unexpected reassignment error.