Part 380 (public charter)
Part 380 is a US Department of Transportation rule that lets a 'public charter operator' buy whole flights from a Part 135 operator and resell individual seats to the public. It underpins the semi-private carriers such as JSX, Aero and XO's shared flights, and the seat-sharing marketplaces that let you buy one seat on a jet. The arrangement has been controversial because it allows scheduled-looking service under charter rules; the FAA and TSA tightened it in 2025 with mandatory passenger screening. For a traveller it means a cheaper, airline-like experience from a private terminal, with the trade-offs of fixed schedules and less privacy than a private charter.