Delta sucks plain and simple... customer service is bad, aircraft are old, first class is second class at best and their frequent flyer program is the pits.
They all suck. American was the worst, followed by Northwest. Continental was good once, but when United bought it they ruined a great airline. I try and avoid flying as much as possible because they all suck equally.
They all have their problems, Delta is better than most.
The average plane in Delta’s fleet is 28.4 years old.
I’d feel safer in one of the old B-17 bombers my dad flew during the war......At least they were built to take it.
I fly quite a bit and customer service on Delta is always good for me.