Delta Air Lines saw its cash balances decline 4.5% to $3.8 billion during the fourth quarter.
Cash, cash equivalents and short-term investments were up 12.8% from $3.37 billion compared to the end of December 2012.
Long-term debt and capital lease obligations fell 3% to $9.8 billion during the quarter. Debt was down 11.7% compared to a year earlier.
Capital expenditures rose $600 million to $2.6 billion at Atlanta-based Delta during 2013. Expenditures include aircraft and its $360 million investment in Virgin Atlantic Airways.
The carrier anticipates $2.3 billion in capital expenditures in 2014.