EasyJet's first quarter revenue fell slightly on the back of the terror attacks in Paris and Tunisia, the budget airline company reported on Tuesday (26 January). However, the company remains upbeat and expects to meet its profit forecast. Sales slid by 0.1% to £930m (€1,216, $1,321) and revenue per seat fell 3.7% over the quarter ended 31 December. The last two months of the quarter saw a decline of "high single digits" because of terror attacks. An 8.1% increase in the number of seats filled could not save EasyJet's sales, although it reported that forward booking is already climbing back up. The upbeat outlook for the following quarters means that the company is retaining its profit guidance of £738m. The challenging tourism environment could spell trouble for EasyJet, which operates with relatively narrow margins because of its low prices. CEO Carolyn McCall underlined the company's mission to keep costs low. "EasyJet's excellent customer proposition combined with low oil prices has allowed it to offer lower fares which has driven an 8% increase in passenger numbers in the first quarter," McCall said. "The EasyJet customer-centric strategy of giving passengers low fares to primary airports continues to be executed well. This year we will consolidate that with a relentless focus on cost reduction which is already delivering." Terrorist attacks such as in Sousse, Tunisia in June and Paris in November have impacted the tourism industry. Following the suspected terror attack on a Russian Metrojet over Sinai, EasyJet was forced to temporarily cancel all flights to Egyptian tourism hotspot Sharm el-Sheikh. However, the company reported a record full year profit in 2015. The year to September saw EasyJet turn a pre-tax profit of £4.7bn, an increase of 18% on 2014.