Just that really. My ds is 16, has a UK passport and is travelling alone to Spain to see my parents. Flight booked on BA, who let 16 year olds fly alone and we have flown many times, so he will be fine.
I have just been looking and some sites say he will need a letter from us (his parents) to get through the Spanish customs (fine) and some sites say it needs to be signed by a notary! But I cannot find a definitive answer. So, does anyone here know?
Thank you for any advice.