I was told by a member of staff at Luton airport during an emergency redirect of my daughter's flight from Heathrow during heavy snow that children (Unaccompanied minors - UMs) cannot normally fly out of Luton. But I don't know if the staff member was speaking for the airport as a whole, or for their specific airline. Nothing on the Airport website, search or FAQs. The airline I want to use does allow them to fly alone at her age. No mention of Luton in their FAQ either.