> Airports desperately need to be displaying accurate information [..]

Airports and airlines may have information that they deliberately do not share with passengers.

For example: a large European airport that I once did some work for ran a trial in which they announced departure boarding gates significantly earlier. The effect was that passengers went to their gates earlier.

The side effect was that retail revenues in the terminal fell during the trial. Yes, this was a metric.

Guess what? They decided not to proceed with announcing departure gates earlier and went back to the previous system.