Planes don’t typically travel at top speed, because it burns more fuel. But they can go faster/use more fuel to try and make up time. Just like if you’re in a car and you could drive 70mph but get worse fuel efficiency than if you drove 60mph, so you choose to drive 60. But if you’re running late, then you might step on the gas and go faster even if you use more gas to get there more quickly.
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