The point in a celebrity campaign is to associate the brand with something. At its worst, the celebrity’s gravitas rubs off, or their likeability. It’s good enough for this person, I’m sure to like it!
But at its best – and nobody does celebrity advertising like Nike – it creates a brand purpose that makes the product a celebrity. Nike celebrates the athletes they have endorsement deals with. They celebrate greatness in sport. And though they’re selling a commodity (shoes, but in many ways airplane seats are similar) they become something consumers want an attachment to as a result.