January 18, 2013 - 10:55 AM ET

American Express global corporate travel sales in the December quarter slipped 1 percent to $4.6 billion. It was the fourth consecutive quarter of year-over-year declining volume. Full-year 2012 global corporate travel sales dropped 4 percent to $18.9 billion. Amex's Global Commercial Services unit, which includes corporate travel and commercial cards, reported a 64 percent drop in quarterly net income to $65 million, attributed to charges and expenses announced last week. Overall, American Express reported December-quarter net income of $637 million, 47 percent lower than a year earlier.