Typical small US airports still don't charge landing fees to light aircraft, but things are changing. Now that ADS-B[1] is deployed widely, airports are looking at automated landing fee charges as another way to soak pilots, just because they now can. A number of companies are sprouting up to meet this demand and offer airports their turnkey systems to monitor and charge everyone who lands, sharing the profit with the airport.

1: https://www.wingsmagazine.com/monetizing-ads-b-data/