I quit flying Delta 25 years ago, after spending the entire night in the Atlanta airport waiting in line to be re-ticketed. Our plane (Delta) had been late getting to Atlanta, and we all missed our connecting flights. Delta’s response - oh well.
Maybe they’ve gotten getter by now.
It is actually difficult to avoid Delta, if flying through Atlanta, but I made a concerted effort and have never flown them again.
I had an episode with Delta in 2003 at JFK, and emerged from that “flight-to-hell” episode to vow never to fly them again. They really left me hanging, gave one-star support, and the return leg of the flight barely got much better. So for eleven years, I kept that promise.
This past May...I had to fly to a funeral in a hurry, and this was the only airline with open seats....so I booked. I came along shocked at the attitude change among the employees, and the better service. Maybe an airline can recover and do things better.
I should note....I have routinely flown Icelandic Air, and found them to be one of the better airlines in terms of service, attitude and on-time schedules.