Saudi Arabia has scaled back a highly ambitious planned city described as a “$9 trillion” project that was originally pitched to include features such as flying taxis and an extremely large skyscraper spanning about 170 km. Reporting indicates the project’s scale is being reduced from earlier expectations, though details vary by outlet and the specific reasons are not presented as a single factor. The revisions are discussed in connection with changes to the project’s timeline, scope, and feasibility of some headline technologies and infrastructure components. Sources describe the proposal as involving major land development and advanced transport concepts, including aerial mobility, but suggest that implementation challenges and practical constraints have affected how much of the original concept can proceed. While the city remains part of Saudi planning activity, the updated plans reflect a move away from the most expansive elements as authorities reassess requirements and delivery conditions. The overall narrative across coverage is that the initial concept was larger than what is now being pursued, with feasibility, implementation complexity, and revised planning assumptions cited as drivers behind the adjustment.