Low-cost airline Easyjet has increased its estimate for full-year profits and announced a special dividend for shareholders. The carrier said its performance had been \"robust\", helped by an increase in business travellers. It now expects annual profits of £240m-£250m, up from a previous forecast of £200m-£230m made in July. Easyjet shares jumped 7% after it said it would add a special dividend of 35p to its 9p a share annual dividend. The latest profit guidance means the airline\'s profits could be up to 40% higher than the £179m analysts were forecasting earlier this year. \"Easyjet\'s commercial performance continues to be robust across the network, with particular strength on city routes used by business and short-break leisure travellers,\" the airline said. Earlier this year, Easyjet altered its strategy to try to attract more business passengers, and in July it said that had led to a 20% increase in business travellers on its flights. Despite the strong performance, Easyjet warned that its fuel bill for next year was expected to be £220m higher than in 2011.