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It’s mostly landing/takeoff records. Big airports have takeoff and landing fees and would keep records such as this for accounting and legal reasons. Being a major airport like LAX means it’s probably mostly private/commercial jets, but also plenty of small time hobbyist aviators are probably wrapped up in this, and would be the only victim here ( general aviation pilots tend to use smaller, local airports but still on occasion hit the big ones).
I work in tech, and have had multiple employees claim they only have “dumb” phones for what I’m pretty sure is this exact reason. And I never blame them, just put the heat on IT to find a solution.