It’s 2001 and the hotel industry is reeling from 9/11. But terror attacks are only the one of the new challenges closing in on Marriott and Hilton.The uniform hotels of the 20th century no longer cut it with young travelers, Starwood is making inroads, and online travel agents are upending vacations.But Marriott’s got another problem to fret about. Because Hilton’s about to shake free of the Hilton family and go on the attack.See Privacy Policy at https://art19.com/privacy and California Privacy Notice at https://art19.com/privacy#do-not-sell-my-info.