A European airline has signed a firm order with Bombardier Aerospace for four Q400 NextGen high-speed turboprop airliners. The transaction includes options on an additional four Q400 NextGen aircraft. According to the Q400 NextGen aircraft list price, the firm order is valued at approximately USD 126 million. The Q400 is a large, fast, quiet, fuel-efficient and technologically advanced aircraft. The order increased the number of Q400/Q400 NextGen firm orders to 412 aircraft, with 357 delivered as of 30 April 2011.