The second, third and eventually fourth quarterly reports from Boeing can be compared to the same reports for the 2018 quarters. The differences in the numbers represent the production cost of the 737 MAX being booked as inventory instead of revenue. These values make for interesting reading as they give deeper insights into the production costs and net customer prices for the model.
When the MAX goes to storage it's delivered to Boeing Commercial Airlane's inventory.
The net production cost appears in an increased inventory cost and the net customer price is missing in revenue.
By careful comparison of the quarterly reports between 2019 and 2018, cost and revenue insights can be gained