Hello,
Once you go over $250, its probably worthwhile getting a generator. If you like to go camping then it is almost certainly worth it.
Little $250 generator, 240vpower point plug, about 70db at 5m from memory. A nice extension cord and place it the other side of the car, be next to nothing.
8hour run time on a 2.1litre tank.
No idea about travel on a plane though, should be safer than a battery if its emptied.
Just make sure your up wind of the gen. when you set up for pollution and noise and should be good.
Steve
PS. This model was closer to 250 last I looked...now $320, but never have to worry about recharging batteries, just extra fuel and they won't go flat or loss charge quickly. If you run from a powerboard then home and darksite cables are the same, battery charger costs etc.
https://www.ebay.com.au/p/6031262717?iid=271531776044