I didn’t realize this until watching it for the first time in many years, but the “guy on the plane” was actually played by Hugh Laurie who is more famous for playing Dr. House in the television series House among other things.

He’s the guy that Rachel sits next to when she flies to England to stop Ross getting married to Emily. And he’s very much not a fan of her.

While I actually disagree with him, I think it’s absolutely hilarious when he agrees that Ross was on a break with her.