1. Do NOT use an adapter. Adapter allows you to plug in your device to a different type of wall outlet, but it does not change voltage. That's what transformers do, but they are more expensive and heavier than getting a new USB charger. Either way, I would get it in the target country.
2. Airlines limit the powerbanks in many ways. One per person, must be in carry-on, must be under certain capacity. Look up the rules that are set by the airline you'll be flying, as they vary.
But I will point out that if you want to charge a powerbank, you need to solve exactly the same problem as charging a phone. You need a USB charger that plugs into a wall outlet, and a cable to connect the device (phone or powerbank) to the charger.
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