Boeing's huge 777-9X airplane takes its first flight

cnn ^ | 01/26/2020 | Chris Sloan

[Yo-Yo]

IF E/S are part of the “purchased package” — you can tell the systems by the airframe. Perhaps the Airbus people outsource the package but I guarantee it is sold to the airline as a configuration.

Yes, that's what I said. It's the airline that chooses the packages, and if you routinely fly in crappy A320s, it's because the airline chose crappy materials.

https://skift.com/2017/05/04/for-the-first-time-allegiant-air-learns-what-its-like-to-configure-a-new-airplane/