Zero problems with Delta in many years of international flights with them. The best US based company, IMO.
My only problem is that their partner for Africa is Air France aka Air Chance, a complete shit show of an airline that never runs on time, has quite rude staff, uncomfortable seats, and makes travellers to its West African flights bus out to the tarmac to get on the plane in Paris.
I guess the world is about to find out about the dogshit that is Air France and CDG when the olympics starts in a few weeks.