Delta were nowhere near as bad as feared. Cabin on the 767 a bit ropey, the 767-400 had old IFE but I was working anyway. Leg room on the A333 was not super brilliant, but I laid out anyway, so no problem. The cabin crew were courteous, but very... American. Rule following, outwardly polite, until it might slightly inconvenience them, then they retreat. Food really not bad. Drinks were a good size, and freely flowing. Plenty of water provided, in full size Dasani bottles. Transit experience in Atlanta was horrible. In JFK not as bad. Atlanta ground staff were absolutely horrible. JFK were very friendly and helpful. Most cabin crew were pretty friendly, I've had far, far worse. Overall, I would fly them again. Late arriving home due to big thunderstorms, but not their fault.
Loved, loved, loved Buenos Aires. Not my first time, but I was there for work for half so didn't see much. The rest was holiday and adored Argentina. BA is such a beautiful city, and the surroundings too. People very friendly, and we had a beautiful apartment for next to nothing.