As mentioned, go to Amazon and choose a device (of your choice) to download. That will become your default device. (You can always change it.)
It will then become the device where your downloads automatically occur.
However, since things are in the Cloud, simply turn off your Airplane mode and check 'All' and look at all of your ebooks. Then, if you wish, just click on it and it will download automatically (to one of your other Kindle devices).
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