Delta Air Lines has uncorked a rebranding of all of its fare types — upending the Basic Economy/Main Cabin/Comfort Plus/etc. order that has dominated the big U.S. airlines for the last decade or so.

Delta Air Lines Inc. on Thursday said it would add first-class seating to domestic flights longer than 750 miles or about 2.5-hours long this fall. Once upgrades are completed, 50 routes that feature ...

Delta Air Lines is facing a class action lawsuit, which claims the airline refused to give refunds following a global technology outage last month. Among airlines, Delta was by far the hardest hit by ...