Now I'm not the knid to go posting about every anomaly I see. I take some time to think and try to answer the question myself, but this seems strange to me.
AS is not consistent in the type of aircraft they operate on the TUS-SEA and vice versa run. Their current schedule shows an MD-80, but it has been a 737 for the past few days. If any of you have a FlightAware account, look into ASA729's history and you can see a whole variety of aircraft being operated on the route. At the beginning of August, it was almost a different type daily. From 7/30 to 8/10, the aircraft each day looks like this (737 = -700): 734, MD82, 734, 734, MD83, 734, 737, 734, 737, 737, MD83, 737. After that it has been primarily 737's with few substitutions. I have never before seen an airline schedule a flight like this. It almost seems as if they use whatever was the first ready to go. Do they use whatever aircraft has the closest number of seats to the bookings without going under? That could be a problem with them always changing the aircraft type.
Now the load question. Does anyone know the loads for this flight (both ways)? The variety of aircraft they use do not have the same seating which could be problematic. The flight is scheduled as an MD-80 until 11/16. On 11/17 it switches to a 737 until 12/30. On 12/31 it is scheduled to operate as a 734. Then from 1/1/07 on, it is scheduled as a 739. Are there enough pax on this route to warrant an aircraft of this size? It would definantly be the largest pax aircraft operating into TUS.
I hope someone can answer this because it is very odd to me.