Thanks moondog, thought I had replied but it seems to have disappeared. The VN flights are a B787 for the main flight then A321 for the shorter one. We never thought about the number of flights into HK. The fare is similar with both airlines. As mentioned it was the landing time in DA Nang that made us look at Cathay but since everyone's great advice think we will go back to looking at VN unless we find another carrier not routing through HK.