Boeing this morning revealed information on its largest order in company history.

In a press release this morning, Southwest Airlines and Boeing today announced the details for an order for 150 737 MAX and 58 Next Generation 737’s.

This order represents the largest quantity of planes ever ordered at a single time, and also is the largest order in terms of dollars for Boeing. The deal is valued at $19 billion at list prices, though its unlikely Southwest paid list prices for such high quantities.

Southwest is the launch customer for the 737 MAX and expects first deliveries to begin in 2017.

In all, Boeing has committments for 900 737 MAX’s from 13 customers.