Don't hold your breathe on the A380 because Delta doesn't have one. No US airline operates one.
Side note: Jumbo jet refers to 747s and A380s. Widebody refers to planes with more than 1 aisle. Think 777s, 767s, A330s, A350s and so on. Like squares and rectangles a jumbo jet is a widebody but a widebody isn't necessarily a jumbo jet.