Alaska Airlines Mileage Plan - One-way on line bookings: eligible for 1000 bonus miles?

Is a one-way booking on AS on line eligible for the 1000 bonus miles, or is a roundtrip required?

I have done a couple of one-way trips on AS within the past few years and each time I still received the 1,000 mile online purchase bonus.

I think I have also on a trip that always had the same price. I guess you can get extra bonus that way but remember you will most likely go through extra security for that.

Just to clarify, I am only planning to travel (by air) in one direction. I'm not trying to earn an extra bonus, but just one bonus for a one way booking.

I am taking the Alaska Railroad in the other direction ANC-FAI.