Sam Altman, the Silicon Valley entrepreneur and investor who leads the OpenAI artificial intelligence company, is joining the Expedia Group board. Expedia Group is expanding the board to 12 members with the addition of Altman, the Bellevue, Wash.-based company said in a regulatory filing Tuesday afternoon. Earlier this year, Altman left his role as the president of the Y Combinator startup accelerator to lead OpenAI in its pursuit of general artificial intelligence, advanced forms of AI with expertise across different domains. The addition of Altman hints at Expedia Group’s broader ambitions to use technology to reshape the travel experience.