Alaska Airlines has firmed options for two Bombardier Dash 8 Q400 aircraft for its Horizon Air subsidiary.

Delivery of the aircraft will occur in 2016 or 2017 and bring the Horizon Air fleet to 54 Q400s, an investor update released today shows. Seattle-based Alaska holds five more options for the turboprop.

“As we grow our operations, we continue to rely on the Q400 aircraft's versatility, speed and comfort to provide a satisfying experience for our customers," says David Campbell, president and chief operations officer of Horizon Air, in a statement.

His comments suggest that the additional Q400s are likely to be used to expand the regional airline’s operations in the state of Alaska, where it began service in March 2014.

The order is valued at $70.1 million at list prices.

Alaska last exercised one of its Q400 options in July 2014, with that aircraft scheduled for delivery this February.

Source: Cirium Dashboard