AB 431, the Advanced Air Mobility Infrastructure Act, directs the California Department of Transportation to integrate electric advanced air mobility (AAM) — eVTOL, eCTOL, and powered‑lift aircraft — into the statewide aviation plan, designate a departmental subject matter expert, run an education campaign for local decisionmakers, and publish planning and zoning guidance for vertiports and electric aviation charging. The bill limits local regulatory authority by prohibiting political subdivisions from enacting laws, ordinances, or rules governing AAM operations or ownership, while expressly preserving airport operators’ ability to regulate AAM activity on their own property.
This is a planning-and-preemption bill: it creates state-level technical and policy leadership for AAM infrastructure and removes most local regulatory barriers to deployment while leaving federal aviation authority and airport operator jurisdiction intact. The core practical effects are to centralize guidance, encourage uniform planning language, and preempt local restrictions enacted before July 1, 2025 — all without specifying funding for infrastructure or permitting processes that will follow.
At a Glance
What It Does
The bill requires Caltrans to update the statewide aviation plan to address vertiports, electric aviation charging, and other infrastructure for electric powered-lift aircraft, designate an advanced air mobility expert in the department, lead a statewide education campaign, and issue guidance for local planning and zoning. It also bars local governments from enacting AAM-related laws, with an explicit exception for airport operators governing activity on their airports.
Who It Affects
Aircraft manufacturers and AAM service providers developing eVTOL/eCTOL systems, airport operators, municipal and county planners, landowners and developers proposing vertiports, utilities that may host charging infrastructure, and local communities facing land‑use changes.
Why It Matters
AB 431 aims to reduce regulatory fragmentation that could slow AAM deployment by producing statewide standards and technical resources while preempting most local rules. For professionals, it shifts the locus of early-stage policy and planning from local ordinances to a state-level playbook, changing who to engage and where permitting and zoning questions are likely to be resolved.
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What This Bill Actually Does
AB 431 narrows the focus of state action to electric advanced air mobility and related powered‑lift aircraft by defining covered vehicles (eVTOL, eCTOL, and similar powered‑lift types) and limiting the statute to vehicles weighing 300 pounds or more or capable of carrying people or equivalent cargo. That definition sets the universe of aircraft the state will plan for and the scope of local preemption.
The bill tasks the Department of Transportation with four concrete duties: revise or expand the statewide aviation plan to address vertiports and electric charging infrastructure; designate an in‑department AAM subject matter expert to be a resource for local and regional jurisdictions; run an education campaign targeted at local and regional decisionmakers; and publish guidance or a guidebook containing best practices and technical resources to promote uniform planning and zoning treatment of vertiports and electric aviation infrastructure.On local authority, AB 431 prohibits political subdivisions and entities within them from adopting laws, ordinances, or rules related to advanced air mobility, ownership of AAM aircraft, or aerial operations — but it creates a carve‑out for airport operators, who retain the ability to regulate operations and takeoffs/landings within their geographic boundaries. The chapter also states that it supersedes any local AAM-related law adopted before July 1, 2025, and includes express language that it does not displace federal authority (notably the FAA) or state zoning laws and does not limit airport sponsors’ rights.The bill closes with constitutional housekeeping: a legislative finding that AAM infrastructure is a matter of statewide concern that applies to all cities, including charter cities, and a fiscal clause asserting no state reimbursement is required because any local costs would be tied to changes in criminal definitions or penalties.
AB 431 sets policy direction and preemption but does not create a permitting regime, fund infrastructure, or specify timelines for implementation beyond the department’s directive to act.
The Five Things You Need to Know
The bill restricts its scope to electric aircraft and powered‑lift aircraft with a gross takeoff weight of 300 pounds or more, or those capable of carrying people or equivalent cargo.
Caltrans must update the statewide aviation plan to include vertiports, electric aviation charging infrastructure, and other aviation technology infrastructure needs.
The department must designate an advanced air mobility subject matter expert, run an education campaign for local and regional decisionmakers, and publish guidance for uniform planning and zoning.
Political subdivisions may not adopt laws, ordinances, or rules related to AAM, aircraft ownership, or aerial operations, but airport operators may regulate AAM operations and takeoffs/landings within their airports; the chapter supersedes local laws enacted before July 1, 2025.
The statute explicitly preserves federal aviation authority (including FAA rules and airspace governance) and says it does not limit state zoning laws or airport sponsors’ jurisdiction; the bill also contains a fiscal clause asserting no state reimbursement requirement.
Section-by-Section Breakdown
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Act name
Declares the chapter the "Advanced Air Mobility Infrastructure Act." This is formal naming only, but it signals that the provisions that follow are meant to form a coherent statewide policy package rather than an ad hoc set of directives.
Definitions (eVTOL, eCTOL, powered‑lift, vertiport)
Sets precise, operational definitions for covered technologies: 'advanced air mobility' (electric aircraft including eVTOL/eCTOL with specified weight/capacity), 'eCTOL' and 'eVTOL', 'powered‑lift' (aligned to federal CFR language), and 'vertiport' (land, water, or structure used for powered‑lift operations, including associated facilities). These definitions determine who and what the rest of the chapter applies to and will be the reference point for any disputes about coverage.
Scope limited to electric and human‑carrying/cargo‑equivalent aircraft
Narrows applicability to electric aircraft and powered‑lift types that meet either the 300‑pound threshold or the human/cargo capacity test. The threshold excludes ultralight or very small drones but captures the class of vehicles companies are developing for passenger or substantial cargo transport; vehicles outside that definition fall outside the bill’s planning and preemption regime.
Department duties: planning, expert, education, guidance
Requires the Department of Transportation to (1) develop or update the statewide aviation plan to include vertiports and electric aviation charging infrastructure; (2) designate an AAM subject matter expert within the department to assist local and regional jurisdictions; (3) lead a statewide education campaign for local decisionmakers; and (4) provide a guidebook with best practices and technical resources for consistent planning and zoning language. Practically, this centralizes early‑stage technical leadership and creates a single point of contact for jurisdictions seeking to align local rules with state guidance.
Local preemption with airport operator carve‑out and grandfathering
Prohibits political subdivisions and entities within them from enacting laws, ordinances, or rules relating to AAM, ownership of AAM aircraft, or their aerial operation, but allows airport operators to adopt rules governing operations and takeoffs/landings within their airports. The chapter expressly supersedes local AAM-related laws enacted before July 1, 2025. This provision reallocates primary regulatory control over siting and higher‑order policy to the state while keeping on‑airport operational control local to airports.
Statewide concern finding and fiscal clause
Legislative findings declare AAM infrastructure a matter of statewide concern that applies to charter cities. The fiscal clause asserts no reimbursement is required under the California Constitution because any local costs would arise from changes tied to criminal definitions or penalties. These are legal and budgetary floor statements intended to insulate the chapter from constitutional home‑rule challenges and limit the state's reimbursement obligations.
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Explore Transportation in Codify Search →Who Benefits and Who Bears the Cost
Every bill creates winners and losers. Here's who stands to gain and who bears the cost.
Who Benefits
- AAM manufacturers and service developers — Benefit from a single state‑level planning framework and reduced patchwork of local rules that can streamline market entry and site selection for vertiports.
- Vertiport developers and real‑estate owners — Gain clearer state guidance and a predictable planning playbook to design and propose facilities and charging infrastructure across jurisdictions.
- Regional and rural communities — Potentially gain improved access to rapid passenger or cargo movement when the state coordinates infrastructure planning that might otherwise concentrate only in large cities.
- Construction and clean-energy workforce — Stand to receive job opportunities from vertiport build‑out and electric charging infrastructure development emphasized in the statewide plan.
- State planners and regional MPOs — Receive technical resources and a departmental expert to align local planning with state objectives, reducing time spent reconciling inconsistent local approaches.
Who Bears the Cost
- Local governments and councils — Lose routine authority to regulate AAM through ordinances, and may incur administrative and community‑engagement costs as they adapt to state guidance rather than local control.
- Airport operators — Face operational and site‑management responsibilities for AAM activity on airport property and may need to invest in infrastructure or update airport rules and safety procedures.
- Utilities and charging operators — May need to invest in grid upgrades and depot charging infrastructure without specified state funding, shifting costs and coordination burdens to private or local entities.
- Neighboring communities and landowners — May bear localized externalities (noise, traffic to vertiports, land‑use changes) while having reduced ability to regulate those impacts through local ordinances.
- State agencies if unfunded mandates emerge — Caltrans is assigned duties without an explicit funding source in the text, which could create workload pressures or require reallocation from other programs.
Key Issues
The Core Tension
The central dilemma is between accelerating statewide AAM deployment through uniform planning and preemption of local restrictions, and preserving local land‑use control and community protections: AB 431 favors rapid, centralized planning to avoid a patchwork of rules, but that approach transfers decision power upward at the cost of local control over land use, nuisance regulation, and the pace and location of infrastructure deployment.
AB 431 is a directional, early‑stage statute: it centralizes planning and removes many local regulatory tools but leaves key implementation questions unanswered. The bill does not create a permitting system for vertiports, does not appropriate funds for charging infrastructure or grants, and does not prescribe timelines or standards for noise, community engagement, safety inspections, or environmental review.
Those gaps mean that real‑world deployment will hinge on follow‑on actions by state agencies, airport operators, local permitting bodies (where authority remains), and federal regulators.
The text attempts to thread a needle by preempting local AAM rules while also stating it does not displace federal FAA authority or state zoning laws and that airport sponsors retain rights. Those cross‑references could spawn legal conflicts: courts may be asked to reconcile the scope of preemption against charter‑city home‑rule claims, the reach of state zoning versus the prohibition on local AAM rules, and the interplay with FAA preemption over airspace and safety.
The 300‑pound threshold and the electric‑only limitation offer administrative clarity but risk excluding future hybrid or alternative propulsion systems unless the law is updated.
Finally, the bill’s promise to ‘‘educate’’ and publish guidance is valuable in theory but functionally uneven without enforceable standards or funding. Stakeholders should expect a period of uncertainty while agencies produce guidance, airports update operating rules, and private developers and utilities negotiate commercial arrangements — a window in which investment decisions and community opposition could slow deployment despite the statute’s preemption language.
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