The Farnborough Air Show is expected to sustain Boeing's momentum in sales of its forthcoming 737 MAX. It's begun already: On Friday, three days ahead of the official opening of the Show, Virgin America finalized a firm order for 23 MAXs.

But Boeing can only sell them if it can make enough of them.

In a pre-Farnborough media tour, Boeing revealed new details of its impressive expansion plans inside the Renton plant. Below is the second of the two current assembly lines, which is being extended.

Boeing also showed us its innovative wing line but was so protective of its proprietary detail that photographers were not allowed to shoot pictures.

How many 737s does Boeing plan to churn out from Renton?

Boeing's Joe Ozimek says the market needs 60 single-aisle jets a month from Boeing and 60 more from Airbus.

Here's a graphic showing the extensive reshaping of the plant.