Our system consists of a dozen flights or so?! ... LOL ...
Now Apple has in the past had a system wide fubar (Remember iMaps Apple fired the guy in charge of that little fubar)...
You just posted several stories that show many airlines are using the iGadget and being they all operate under the FAA rules well when we get another fubar update from Apple then I guess ALL the planes in those airlines too will be grounded or delayed etc.
Single point of failure...