Net sales increased 20% to $63.4 billion in the second quarter, compared with $52.9 billion in second quarter 2018. Excluding the $814 million unfavorable impact from year-over-year changes in foreign exchange rates throughout the quarter, net sales increased 21% compared with second quarter 2018. Operating income increased to $3.1 billion in the second quarter, compared with operating income of $3.0 billion in second quarter 2018. Net income increased to $2.6 billion in the second quarter, or $5.22 per diluted share, compared with net income of $2.5 billion, or $5.07 per diluted share, in second quarter 2018. "Customers are responding to Prime's move to one-day delivery — we've received a lot of positive feedback and seen accelerating sales growth," said Jeff Bezos, Amazon founder and CEO. "Free one-day delivery is now available to Prime members on more than ten million items, and we're just getting started. A big thank you to the team for continuing to make life easier for customers."