Delta Air Lines cut its full-year profit forecast after third-quarter earnings fell short of expectations, with its quarterly fuel bill rising 62% from a year earlier.

Delta reported adjusted earnings of $1.72 per share, below the $1.82 estimate. Adjusted revenue rose 15.7% to $17.58 billion but missed the $17.76 billion estimate. The airline said fuel cost $500 million more in the quarter than it had projected in July.

Delta lowered its adjusted earnings forecast to $5.10–$5.60 per share from $6.50–$7.50 and reduced its free cash flow forecast to $2.5 billion from $3 billion–$4 billion. Chief Executive Ed Bastian said the airline expects to absorb a $6 billion increase in fuel costs for the year. Premium business grew 18% from a year earlier, but was not enough to offset the fuel pressure.