Does anyone know the timeline of DL 75s going into and out of the desert? I know they generally put newer aircraft with less cycles in the desert so they can fly the heck out of the older ones. They put N631DL in the desert just this week. It's an older one. a 1987 build, but there are much older ones still flying. Is this one going in for good? How many more is DL putting in the desert in the near future? Any input would be appreciated!