Interesting article about the history of Star Tours: Taking a Trip on Star Tours
This was my favorite part, where the writers for Star Tours 2 get Lucas' approval:
It was with some trepidation that the Imagineers showed the possible storylines to Lucas. “He was very nice,” Surrell remembered. “He said he liked what we proposed but he was disappointed that the adventure on Hoth didn’t include the Walkers. We explained that since according to the timeline that the rebels had not yet established a base on the planet that we couldn’t use them. “George looked at us and said, ‘Who cares?’ We were stunned," Surrell said.