Delta Air Lines reported a sharp increase in adjusted earnings for the first quarter, helped by a 5% revenue growth. Delta also provided guidance for the second quarter, predicting strong earnings and revenue growth. Adjusted earnings increased 28% annually to $0.96 per share in the first quarter, helped by strong core performance and benefit from the early renewal of the agreement with American Express. During the quarter, the management returned $1.6 billion to shareholders, including $1.3 billion of share repurchases and $233 million in dividends. Delta also extended its partnership with American Express up to 2030, under which the companies will continue to work together and deliver value-added services to customers. The arrangement is expected to bring benefits of about $7 billion annually to the company over the next four years.