I am headed to UK next and hope to see one of these billboards in London (they are not that new, but I have not been to London in a few years).
"The charming execution, which featured adorable children on the digital boards pointing at overhead planes, masked a technologically complex backend. It involved mounting an antennae on the roof of a building near each board. The antennae picked up data from the transponders of British Airways aircrafts within 200 kilometers and fed that information into to an application that identified the flights. The application then sent the information to a server that served the messages about the plane's destination or origination. A "trigger zone" acted as a trip wire to determine when a plane should instigate a message and cloud altitude data determined if the plane could actually be seen."
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