I work on contract for the FAA which uses the aeronautical charting and mapping extensions. I'm sure others work for NOAA or the Department of Defense which have their own mapping extensions. At the highest level developer subscription I still have to ask for trials of these extensions in order to develop solutions. The highest level developer subscription should include the whole enchilada -- all the extensions and products we might need to develop for. It shouldn't be that I'm working with trial authorizations to develop a solution to load AIXM data.