Nearly half a century after it became the first U.S. airline to fly twin-engine DC-9s, Delta Air Lines retired the last of those venerable airliners Monday.

Corporate travel, a mainstay of Delta’s business, is climbing and a recovery in international travel is under way as travel restrictions have fallen away.

Delta says it has flown a total of 305 DC-9s since 1965. In announcing the retirement of its last DC-9 jets, Delta notes it has removed or retired more than 350 aircraft from its fleet since 2008.

Delta Air Lines is retiring its last DC-9s, the oldest passenger plane in the fleet of the big U.S. airlines. Delta operated the final passenger flight from Minneapolis to Atlanta Monday evening ...

MINNEAPOLIS | Delta Air Lines is retiring its last DC-9s, the oldest passenger plane in the fleet of the big U.S. airlines. The plane that will fly Delta's final scheduled DC-9 passenger flight is … ...

MINNEAPOLIS — Delta Air Lines is retiring its last DC-9s, the oldest passenger plane in the fleet of the big U.S. airlines. The final passenger flight was planned for Minneapolis to Atlanta on ...