Aircraft on ground

Aircraft On Ground or AOG is a term in aviation maintenance indicating that a problem is serious enough to prevent an aircraft from flying.^[1] This can involve problems as simple as a light bulb being out, or as complex as a damaged engine. Boeing estimates that a 1-2 hour AOG situation will cost an airline from 10,000ドル to 20,000ドル and possibly even as high as 150,000ドル per hour depending on the type of aircraft and route flown.^[2]

AOG incidents can arise from various factors, including:^{[citation needed ]}

• Mechanical failures: Unexpected mechanical issues or failures during flight or pre-flight checks can ground an aircraft.
• Maintenance delays: Scheduled maintenance that extends beyond the expected timeframe can result in AOG status.
• Supply chain issues: Delays in obtaining necessary parts or components can hinder timely repairs, leading to extended grounding periods^[3]
• Regulatory compliance: Aircraft may be grounded due to non-compliance with safety regulations or certification requirements.
• AOG can also refer to an aircraft waiting for a flight crew at a different airport, where flight crew are not available. Crew scheduling can designate an inbound deadheading crew, to operate this flight, as "AOG" which makes this crew the highest priority to get seats on the flight. Passengers, even in first class can be "bumped" to accommodate the AOG crew. ^[4]

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