Horizon Air (QX, Seattle Tacoma International) has committed to three more DHC-8-400s and reconfirmed options for a further seven, Bombardier Aerospace (BBA, Montréal Trudeau) has announced. The move now brings the Seattle-based operator's orders to fifty-one Q400s. Based on the list price of the Q400 NextGen aircraft, the contract is valued at approximately USD98million.