What is LOA (Letter of Authorization) & How Does it Work?

Definition

LOA stands for Letter of Authorization, a formal document issued by a regulatory authority—such as the FAA in the United States—that grants an individual or organization specific operational privileges. In drone operations, an LOA typically authorizes activities that fall outside standard limitations, such as flying in controlled airspace, operating Beyond Visual Line of Sight (BVLOS), or conducting nighttime missions.

Usage

Drone pilots and operators may request an Letter of Authorization when planning missions near airports, within restricted zones, or involving specialized tasks like package delivery or surveillance. The Letter of Authorization outlines the scope, duration, and conditions of the authorization, serving as official legal permission to operate under otherwise prohibited scenarios.

Relevance to the Industry

As drone use expands into complex commercial applications—such as infrastructure inspections, emergency response, and urban delivery—LOAs are increasingly crucial. They ensure operators stay compliant with aviation regulations while enabling innovative flight operations. The Letter of Authorization process helps mitigate risk and demonstrates that the operator has met safety, communication, and procedural standards required for non-standard missions.

How Does an LOA (Letter of Authorization) Work?

An LOA is typically obtained through the following process:

• Application Submission: Operators submit a detailed request including flight intent, equipment specs, and safety procedures.
• Regulatory Review: The authority reviews airspace impact, operator qualifications, and risk mitigation strategies.
• Issuance: If approved, the operator receives an LOA with specific operational parameters—altitude limits, airspace boundaries, duration, and communication requirements.
• Operational Execution: The drone mission must strictly follow all conditions laid out in the LOA. Deviations can result in fines or revocation.

LOAs are often mission-specific but may also apply for extended timeframes depending on use case and operator experience.

Example in Use

A construction company receives an LOA to operate drones near a Class D airport for routine structural inspections. The LOA permits operations between 7 a.m. and 6 p.m. at altitudes under 100 feet AGL, with required ATC coordination before each flight.

Frequently Asked Questions About LOA (Letter of Authorization)

Is an LOA the same as a waiver or exemption?
Not exactly. While similar, an LOA is a formal permission letter from an authority, whereas a waiver or exemption typically allows deviation from a specific regulation. LOAs are more about procedural access to airspace or resources.

Who can apply for an LOA?
Any certified drone operator (such as those with a Part 107 license in the U.S.) may apply, provided they submit the required safety documentation and meet operational requirements.

How long does it take to receive an LOA?
Timelines vary by jurisdiction. In the U.S., it can take from several days to weeks depending on the complexity of the request and the airspace involved.

What happens if you fly without an LOA where one is required?
Unauthorized drone operations can result in fines, license suspensions, or legal actions, especially in controlled or sensitive airspace.