Blanche wrote:

1. Get out the A/FD and read the info
2. Go to Airnav.com and read the info
3. Go to Sedona's website and read the info

sedonaairport.org

Those are good references, but they don't answer the OP's question. The custom of landing on 3 and
departing on 21 is not documented in the AFD. It's just local common practice. (and seems like no harm
in asking here).

Mike