Well it can travel much faster than land vehicles (trains, boats, or trucks), which normally move the bulk of machenery and vehicles. We are talking about moving many times the amount transport planes can move, at a fraction of the price. The "stealth" feature is similar to the idea of the stealth fighter and bomber, the skin does not reflect radar. In addition to that, it can fly above radar when necessary. Theoretically, it can also fly below radar at night, when it can't be seen as easily.
This is a possibility, I don't claim to actually know this. Call it speculation.
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