A stranger stole the seat I paid extra for and forced my 10-year-old daughter to sit alone. I was about to call the flight attendant when Maya squeezed my hand and whispered, “Don’t.” Ten minutes after takeoff, she stood up, pointed at the woman in 11A, and said one sentence. The woman’s face turned white—and suddenly, nobody in the cabin made a sound.

I stopped beside Maya. I took her small hand, gripping it tightly, and pulled her back to Row 14, the power dynamic of the entire flight permanently, violently inverted.