The Airbus A321neo.
Delta's domestic first-class seats on board an Airbus A321neo.
  • Data analytics firm JD Power released its annual airline customer satisfaction study on Wednesday.
  • Delta rated best first/business and premium economy cabins. Southwest won for best economy cabin.
  • Overall, the study found traveler satisfaction driven most by desire for a safe and easy experience.

Delta Air Lines has reclaimed its crown as passengers' No. 1 pick for its first/business class, according to JD Power's newest airline rankings.

Delta regained the top spot after coming in second last year to JetBlue Airways. JetBlue fell to second place this year, followed by United Airlines.