Originally Posted by
Beansprout
What's the law onboard?
I only ask because on my first ever solo flight (at 17) I used BA's unaccompanied minor service (skipped the queues so why not!). I found myself upgraded to premium economy at the gate....first FA came over and told me to ask them if I needed anything. Second FA came over with pre-departure fizz

On the ground I think technically it's the law of the country you're in, but once in the air the law of the country that the aircraft is registered to applies. But really these are only technicalities