On May 23, 2007, the FAA issued a final rule amending the regulations governing Passenger Facility Charges (PFC) (14 CFR Part 158). The amendments respond to mandates in Vision 100 and other concerns. For example, the amendments identify low-emission airport vehicles and ground support equipment as eligible projects under certain circumstances, allow the use of PFC revenue to pay debt service on certain ineligible projects, and further protect PFC revenue in bankruptcy proceedings.