From their Facebook page:
https://hub.united.com/en-us/News/Co...000-order.aspx
Today we announced an order with Airbus for new A350-1000 aircraft. The agreement converts our existing order for 25 A350-900s into A350-1000s and adds 10 firm orders for A350-1000s, giving us a total order of 35 aircraft. The increased seating capacity of the A350-1000 will enable us to replace older, less efficient aircraft currently serving long-range, high-demand markets. We expect delivery starting in 2018.
https://hub.united.com/en-us/News/Co...000-order.aspx
Today we announced an order with Airbus for new A350-1000 aircraft. The agreement converts our existing order for 25 A350-900s into A350-1000s and adds 10 firm orders for A350-1000s, giving us a total order of 35 aircraft. The increased seating capacity of the A350-1000 will enable us to replace older, less efficient aircraft currently serving long-range, high-demand markets. We expect delivery starting in 2018.