How do you access balloons that are already in the air?

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Twice now I have come across the fast travel balloons and they have already been up in the air. I can't find anything to make them come back down. What's the secret here, how do you access the balloons that are in the air already?

Mad Max
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There is usually a yellow terminal/machine nearby. Normally you need to put fuel into the yellow machine that has the funnel and then the controls become available that let you call the balloon back down