Delayed again: Delta to keep 44-seat first class A321neos until 2028 as lie-flat seats slip further

The decision to keep the 44-seat layout comes right before the summer travel rush.
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How much does it cost to upgrade to first class on Delta Air Lines?

How much does it cost to upgrade to Delta First or business class for domestic flights on Delta Air Lines? Like other carriers based in the Americas, Delta does not offer a true first class fare, and ...