I have never flown on Alaska Air...and still stand by what I said. I know that in Cancun, and at other airports, there are teams that sanitize planes between flights. But if the guy next to you is sneezing there's not much you can do. The plane can be clean when everyone gets on, but by mid-flight it won't be. And plenty of older airplanes have poor ventilation systems, I've been on more stinky flights that I can to remember.