Discount carrier Frontier Airlines on Thursday cut its profit forecast, blaming it on the fallout of a failed plot to bomb US airliners that was uncovered by British police in August.

Frontier's shares fell more than 13 percent after the news.

Denver-based Frontier said it now expects to post earnings per share in its fiscal second quarter of 1 cent to 5 cents, before the impact of unrealized fuel derivative gains and losses.

The incident hurt travel demand primarily in September, Chief Executive Jeff Potter said in a statement.

"Like the majority of the industry, we were not immune to the effects of the terrorist incident in early August," Potter said. But he said bookings were strengthening for the company's third quarter, which ends in December.