Sifting through the America West site for a week next January (I must have too much time on my hands!), I come up with the following obsevations:
1. It seems there will, indeed, be two Edmonton - Phoenix flights each day (14 per week). The Los Angeles service will be four per week (Mon,Wed,Fri,Sat). Las Vegas remains seven per week.
2. There will thus be a net increase in Edmonton service of four flights per week. Although the airline's experience in this market may have been quite good, they do not have much capacity to throw around. In fact, with the impending US merger, there will be fewer aircraft in total. Any market even holding its own is doing well.
3. It is interesting to view this in conjunction with the new Hawaii service discussed above. It seems one will be able to book Edmonton - Hawaii flights through Phoenix. The total flight time is more than other routings, but the connections do not look too bad. (Perhaps an expert might post a more knowledgable analysis!).
Just musing.