I fly to alaska often (again this week!). There are NEVER cheap fares to FAI because only major flying the route is Alaska. There is is local carrier(from ANC), frontier flying service competing. However flights are limited,on a beechcraft, and no miles! Wait i forgot that Delta has one late night departure (with one early morning return) that is about $50 cheaper. But if it breaks,or is delayed... your options are non existant.