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 to $20,000 and possibly even as high as $150,000 per hour depending on the type of aircraft and route flown.
[2] AOG incidents can arise from various factors, including:[citation needed]
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