Aviation learned this the hard way. For most of the industry's history, the number that best predicted whether an airline would survive was how much of the day each aircraft spent on the ground.

The reason is structural. An aircraft's costs accrue by the calendar hour: financing, depreciation, hull insurance, scheduled maintenance, crew contracts. Its revenue accrues only by the flight hour. Every hour spent on the ground shrinks the output side of that equation while the cost side keeps running exactly as before. Utilization also sits downstream of almost everything else an airline does. Turnaround discipline, network design, maintenance planning, crew rostering, and spare parts availability all eventually show up in that one number, because a broken operation underneath it keeps planes on the ground no matter what else goes right.

A bigger fleet still helps. More aircraft means more available capacity, plainly and simply. But two airlines flying comparable fleets on comparable routes can end up with very different economics, and most of that gap traces back to one measurement rather than fleet size.

Enterprise AI is running into the same structure, on a different piece of hardware. A GPU accrues cost by the calendar hour too, through financing, depreciation, power, and cooling, whether or not it's doing anything useful in a given moment. Its output only accrues by the compute hour. More GPUs helps in roughly the way a bigger fleet helps an airline: real capacity, a genuine advantage, and still no guarantee of the result that actually decides who wins.

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