AOG, or Aircraft on Ground, is a term used in the aviation industry to indicate that an aircraft has a problem that prevents it from flying. This can be a serious issue, as it can lead to delays and cancellations of flights, which can be costly for airlines. To mitigate the effects of an AOG situation, airlines have AOG desks that are staffed 24/7 by personnel trained in acquiring and shipping critical parts and materials. These personnel are also trained to borrow or loan parts from other airlines in accordance with FAA and EASA regulations. In some cases, insurance policies are available to cover the costs associated with an AOG situation.

Mitigation of AOG status

When an aircraft “goes AOG” and the required materials are not on hand, the AOG desk at the airline will work to acquire the necessary parts and personnel to repair the aircraft. This process may involve contacting the manufacturer's AOG desk, or even competitors' AOG desks, to borrow or loan parts in accordance with FAA and EASA regulations. The AOG desk will also coordinate with the airline's maintenance operations department to ensure that the repair is completed as quickly as possible. In some cases, local engineering support or support flown out from the airline's base may be used to repair the aircraft. Insurance policies may also be available to cover the costs associated with having an aircraft out of service.