Aircraft on ground (AOG)

A term used when an aircraft has been grounded due to issues, including scheduling conflicts, weather or mechanical problems. Aircraft designated as AOG are prioritized to receive any service that may be required, for example, supplies or repairs, to return to the air as quickly as possible.

Key takeaways

  • Definition: AOG is a critical event where an aircraft is grounded due to mechanical or operational issues, requiring immediate action to resume flights.
  • How it works: When an aircraft is declared AOG, urgent activities are initiated to resolve the issue. This involves assessment, parts replacement, and repair work.
  • Types: AOG types include mechanical failures, maintenance overruns, missing equipment, operational issues, and weather-related groundings.
  • Pros and cons: Advantages include prioritizing safety and providing business for suppliers. Disadvantages involve revenue loss, logistical issues, and customer dissatisfaction.
  • Explore your options: For handling AOG-related logistical challenges, partnering with trusted fleet management services like Motive and Trimble can be invaluable. They offer real-time tracking and expertise in quick response.

How it works

When an aircraft is designated as "aircraft on ground" (AOG), it triggers a chain of urgent activities aimed at getting the plane back in the air as soon as possible. The term indicates that the aircraft has a serious issue that prevents it from flying, requiring immediate attention. Technical teams assess the problem to determine what parts or repairs are needed.

This AOG status significantly impacts the trucking industry, as speed is of the essence to get the required parts to the grounded aircraft. Specialized AOG couriers or trucking services are often employed for expedited delivery. These services specialize in rapid, time-sensitive transportation, sometimes across great distances, to deliver parts that are essential for aircraft repair. The trucks used are often equipped with advanced tracking and monitoring systems to provide real-time updates and ensure timely delivery.

Moreover, the AOG situation could lead to ad-hoc charters of trucks for exceptional deliveries. Trucking companies may have to adapt their schedules and routes on the fly to accommodate these high-priority shipments, affecting their regular operations. Some trucking companies specialize entirely in AOG logistics, offering 24/7 services to cater to the unpredictable nature of these incidents.

AOG situations create a high-pressure environment that necessitates quick, coordinated efforts from multiple industries, including trucking. The trucking industry plays a vital role in resolving AOGs, providing rapid transport solutions that help minimize downtime and financial losses for airlines.

AOG types

Aircraft on ground (AOG) situations can vary widely based on the reason for grounding, urgency, and required actions. While not a formal classification, you can generally think of AOG incidents falling into these types:

Mechanical failures

This is perhaps the most urgent type of AOG, involving critical mechanical issues that make the aircraft unsafe for flight. Immediate repairs and part replacements are required.

Scheduled maintenance overrun

Sometimes an aircraft may go into scheduled maintenance but issues are discovered that prolong the work, turning it into an AOG situation.

Missing or damaged equipment

This can range from missing safety gear to damaged in-flight entertainment systems. While not always critical for flight, some equipment is legally required to be onboard.

Operational issues

This could be due to issues like crew shortages or documentation problems. Though not a technical fault in the aircraft, such issues can still result in an AOG status.


Extreme weather conditions can cause an AOG if they result in damage to the aircraft, such as hail damage to the fuselage or wings.

Each type of AOG poses unique challenges and can require specialized solutions, often involving quick response from maintenance crews, supply chain teams, and even the trucking industry for parts delivery.

Pros and cons

Aircraft on ground (AOG) situations are generally considered negative events due to the disruptions they cause, but they do have some indirect benefits for various stakeholders. Here's a look at some of the advantages and disadvantages:


  • Safety priority: An AOG ensures that an aircraft doesn't fly until it's safe, prioritizing passenger and crew safety.
  • Quality control: AOG events can help identify systemic issues in aircraft maintenance or operation, leading to overall improvements.
  • Business for suppliers: AOG situations create immediate demand for parts and specialized services, benefiting suppliers and expedited logistics providers.
  • Skills enhancement: These emergency situations can help maintenance crews and logistical teams improve their problem-solving skills under pressure.


  • Revenue loss: A grounded aircraft can't generate revenue and often incurs additional costs for repairs and part replacements.
  • Logistical problems: An AOG can cause cascading delays across the airline's network, disrupting schedules and requiring costly rescheduling.
  • Customer dissatisfaction: Passengers facing delays or cancellations due to AOG may lose faith in the airline, damaging its reputation.
  • Resource drain: The urgency to resolve an AOG situation may require diverting resources from other important tasks, impacting overall operations.

Understanding the pros and cons of AOG can help airlines, maintenance crews, and logistic partners better prepare for and manage these challenging situations.

Explore your options

Now that you're familiar with the various types of AOG scenarios and their impact on the trucking industry, consider partnering with trusted fleet management services like Motive and Trimble. 

Both companies are leaders in the field, offering innovative solutions that can help trucking businesses effectively manage the logistical challenges posed by unexpected AOG events. With their cutting-edge technology and real-time tracking capabilities, you can swiftly respond to AOG situations, ensuring that crucial aircraft parts are delivered on time. By leveraging the expertise and reliable services of Motive and Trimble, you can enhance your fleet's performance, reduce downtime, and gain a competitive edge in handling AOG scenarios.

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