My flight was only delayed by 30 minutes last week amd they didn't lose my luggage. Does that qualify?
LOL.
I've looked through my passenger log and the last great experience I had in Y Class this century was in 2007. Classic B737-200, great friendly and fun cabin crew, great service (including hot meals on 1.5hr sectors, and punctual. The airline was Canadian North from Edmonton to Yellowknife and back. It quite surprised me at the time.