Credit for this one goes to the worthy personage I know only as Calm And Insane.
The Sayo Communication System
By Cainn Males
It is commonly accepted that Sayo Aisaka was a ghost member of Ala Alba. However the more we learn the harder it is to accept this as fact. For one thing we have never found any physical evidence of her existence anytime after the year 1940. He status as a ghost has, up until now, allowed us to accept this with few questions. However by taking a close look at the facts it is possible to conclude that Sayo Aisaka was not a ghost, but a communications network.
First, the legions about how Aisaka single-handedly found and directed a recue party towards the lost members of Ala Alba when they were scattered across the magical world is difficult to believe. How can one person, even with unlimited energy, the ability to fly, and never having to sleep, accomplish this in under a month? Only if they were extremely lucky would such an event be possible. Instead it is much more likely that Ala Alba was using a complex planet wide communication system, the likes of which we currently have today. This was likely a primitive system that combined magic and technology, much like Chachamaru. This would explain the short time it took to locate and direct the rescue party towards the lost members, and why it took so long. As a primitive system it must have had to been calibrated for the world it was used on manually. Considering this was the first system of its kind, the fact that the calibration was done in under a month is amazing, but much easier to believe than a ghost searching the entire world.
Additionally, ghosts are rare occurrences, and achieving communication with a ghost without specialized magic was virtually unheard of back in the twenty-first century. That a mundane (the old term for a person that was not aware of the existence of magic) is rumored to have discovered Aisaka makes this simply impossible to believe. Also, Sayo kept giving people information about what was happening and finding things about other places. This is the exact function of communication systems.
Sadly these amazing pieces of magical technology were destroyed, most likely during the Descendants Wars, and were lost to time. Eventually their existence were uncovered, and without having the full story, we classified them as ghosts. Now we have the full knowledge of the true events though, and know that they were unusually advanced masterpieces, something not uncommon to find when a Springfield is involved. Hopefully we may one day find the remains of one of these systems and learn how Ala Alba communicated on a global scale.