Alaska Airlines will offer travelers both business and leisure flights from Everett’s Paine Field when it launches service there in the fall of 2018.

“What you’ll see are supplemental flights,” Joseph Sprague, the senior vice president of external relations with Alaska Air Group Inc., said Wednesday. “We’re quite convinced about the strong demand up there. We know who our customers are in North King County and in Snohomish County and we know where they fly.”

He declined to elaborate.

RELATED:…