Once an aircraft has left the ground, it is in Federal Aviation Administration (FAA) jurisdiction. Pilots that are flying low and/or unsafe may be reported directly to the FAA Flight Standards District Office (FSDO) by calling (510) 748-0122. You may also notify Airports staff by submitting an Airports Feedback Form. FAA regulations do allow for aerobatic aircraft operations in an area south of the City of Antioch and to the west of the City of Brentwood. While it is unlikely the aircraft are originating from Buchanan Field and/or Byron Airport, Airports staff has responded by sending out notices to all of its tenants at Buchanan Field and Byron Airports requesting that pilots not perform aerobatic operations near residential developments. An outreach was also sent to other Bay Area airports to provide the notice to their tenants of the community feedback Airports staff has received. This is an on-going task, and your sustained input and support is key to this community-wide process.