Swift Transportation Co. said its third-quarter and full-year results will lag analyst forecasts and its own profit guidance because of costs from past accidents and weaker freight volumes in the fourth quarter.

Swift Transportation Co. has amended its credit agreement to add $150 million to its revolving credit facility and revised term loans, the company announced in a Securities and Exchange Commission filing.

Swift Transportation Co. said its third-quarter net income climbed to $50.2 million, or 35 cents per share, from $30 million, or 21 cents, a year earlier.

Executives from Swift Transportation Co., scheduled to make a presentation at a Las Vegas conference, were forced to cancel due to record floods in Phoenix, where the company is based.

Swift Transportation Co. said net income slipped 19% to $40.2 million, hurt by weaker profit margins at its dedicated and refrigerated units.

Swift Transportation Co. reported its first-quarter net income fell 59% to $12.3 million, or 9 cents per share, as winter weather drove down profits.

Swift Transportation Co. said it expects its first-quarter earnings to be 11 to 13 cents per share, lower than previously expected, due to severe weather.

Swift Transportation Co. said its fourth-quarter profit fell as expenses such as salaries, supplies and claims increased.

Swift Transportation Co. said it will earn a profit of 33 cents to 36 cents per share in the fourth quarter, lower than its estimate of 40 cents.

Swift Transportation Co. reported its third-quarter profit declined from a year ago on “less than ideal market conditions.”