You can't use the booster on the plane BTW...at this age we use the ride after vest (also done approved for airline use) my kid boards with it on and we stash under the seat
You can’t use a booster in an airplane. They’re to position the shoulder belt, which planes don’t have.
If you mean at your destination, check out the ride safe vest. That’s what we used for my son from about 5-7.
No, don't need for any public transport.
Even taxis don't require car seats, but might still be wise for safety.
For rental cars, it's very cheap to add car seat option.
If you travel a lot with a kid, I recommend getting [https://www.amazon.com/RideSafer-Lightweight-Convenient-Everyday-Rideshare/dp/B07WMTQHCL/](https://www.amazon.com/RideSafer-Lightweight-Convenient-Everyday-Rideshare/dp/B07WMTQHCL/), it's very compact and saves a lot of headache.
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