In fact, Sequence of Events Recording systems using GPS time sync are indeed used in airports, but it is less common, in my experience. To know precisely the status of equipment and a record of events is useful, but its usefulness depends on the complexity of the electrical network. If the airport uses a simple radial system with manual backup power systems, then 1-second resolution of events may be sufficient. If the airport is modern, with some data centers, UPS power, backup generation, etc, then it could be very useful for the network operator to have this precision. Of course, everything is subject to budget, so that is why larger data centers, hospitals, and other “critical power applications” are more likely to justify this equipment.