Los Angeles County is pursuing overdue taxes and penalties from private-jet owners whose aircraft were habitually situated in the county but had not been properly assessed. Hundreds of notices issued this year are expected to generate $38 million in additional revenue, with individual bills reaching as much as $240,000. California imposes an annual 1% property tax on private planes based on where they spend the most time on the ground, regardless of registration location or the owner’s residence. The assessor’s office used ADS-B Out location data to identify aircraft that frequently operated from California, a method criticized by privacy advocates and some lawmakers. The controversy comes as private jets face broader scrutiny: the Institute for Policy Studies’ High Flyers 2023 report said they account for roughly one in six FAA-handled flights but contribute 2% of the taxes that primarily fund the agency, while emitting at least 10 times more pollutants per passenger than commercial aircraft. The global private-jet fleet grew 133% from 2000 to 2022.