Qatar has 3 levels of economy fares. Classic, Convenience and Comfort. Classic has no seat selection. Convenience allows for standard seat selection. Comfort allows for premium seat selection. N class allows for seat selection hence it cannot be the lowest level like savers are on Alaska. The lowest class fare on Qatar are T, O, W. However Alaska CS states that all economy fares are considered basic economy for mileage determination so any economy ticket with less than 100% will only earn the tabled % miles flown.