Re: Now an intelligent design
Nonsense. All the work before commissioning a vendor to write the software is portable to the second vendor.
Also, the first is likely to have asked most the questions you didn't think about, making it easier for the second.
If you have two suppliers work simultaneously you may get questions from both that make both products better.
As for the comment above about buying twice as much hardware, the article mentions the pilot and copilot's iPads both going blank. So you already have two devices, this is just about enduring there's redundancy beyond the physical device.