KLM was the original carrier. Delta is only tied because they tried to help this lady after KLM could or would not. It is unfortunate and tragic, but she did refuse medical treatment in the country she was in. I can hardly see how DL has responsibility here. Rather, shouldn't we look at the husband who knew of her weight and mobility issues and should have booked a seat that would accommodate her? He did book two coach seats for her so maybe he tried, but most carriers have seats called "business" or "first class". A person of her size would have at least "fit" in the forward cabin. Not sure what the weight limits are of those seats, but I've seen many a person of size up front.