Use the SMIT fast path to perform the following tasks.
Your root user login name must be included in the /var/adm/cron/at.allow file or you must have root user authority.
At the prompt, type:
smit lsat
This command displays a list of all the print jobs you have scheduled. If you have root user authority, the command lists all currently scheduled print jobs.
smit sjat
At the prompt, type:
smit rmat
Select List to delete the job number.