>No company will be foolish enough to build a business/service that relies on another entity, It's an airline operating at an airport. That operation is alrea

>No company will be foolish enough to build a business/service that relies on another entity, It's an airline operating at an airport. That operation is already inseparably interwoven with number of other organizations - including the government - just to move a tube full of people from point A to B. >much so a government organization that is not known for building highly scalable services In that case, it's good for them that they have such a highly predictable load target. Airports have a fixed number of gates and a maximum number of planes ATC can smoothly get into the air in an hour. There's your upper bound. Flight plans and ticket sales set the normal band and refine the performance target. Load can be well understood, and they have lots of visibility into future demand changes. >This is a crucial part of their process It's a pilot program. As much as I doubt they'd let this system ever be a single point of failure under normal operation, an experimental system certainly has a fallback plan for boarding.