Doesnt care for foreigners

how Delta airlines is trying to **** my son. Instead of checking paperwork for the USA in South Africa on their partner airline he was refused to fly in Amsterdam. He has been left all night on a bench without a blanket or any care. This is an absolute disgusting behaviour and is an absoltue disgrace. I have many points with this airline and have been a fan but this is an American and a Delta attack on my sons life. You cannot believe people can behave this way in this age. Im sickened. On top of it he has a lung problem