Refer to the Chart:
Looking at the slope lines does not include units delivered after the first 884 days. Why that number in days? Because data is available for this comparison after Airbus delivered its 84th A-350-9 XWB on May 24, 2017, during the Airbus 884th day of production. This came after its first A-350 delivery on December 22, 2014 making it a 884 day span of time. In fairness, Boeing also had a first 884 days of production complete with extensive teething woes such as the battery and fastener issues. A far more complex Boeing aircraft was attempted than Airbus could muster forth.
The news improves further when going past Boeing's-February 2014 884th day out from first delivery in September 2011. Boeing now can produce 12, 787 a month when called upon. Airbus is pacing at about five or six a month, but will increase that number when possible. The great news is Boeing can extend the order book at this time without having its customers wait for aircraft too long of time rather than if a customer placed an order with Airbus. They will wait longer than three years for delivery unless an early slot opens due to a cancellation. Boeing can now promise its customers a frame under five years time within that customer's five year financial planning model typically used by most all of industry.
The thirty period range represents approximately the first thirty months of production for each Boeing or Airbus WB type offered with the 787 and A-350 class of aircraft. It's time Boeing to take the gloves off the gloves and dominate further.