Aux4ever -- You did not specify if you chose to run the AUX 6 / 0 or as 5 /1. With your "the regular wants a day off but we have no subs,", I am going with you are 5 / 1, which makes you the primary leave replacement when the regular needs / wants to be off. So in that case, manglement can have you fill in for the regular and have someone else run your AUX.
-- Manglement can not schedule for more than 12 evaluated hours in a day ( Step 4 -- R-96 ) - ( although the actual time to complete assignment(s) may take more than 12 hours ), so that pretty much rules out running your AUX and then a regular route.
-- For 6 / 0 and 5 / 1 AUX carriers, the new contract ( page 49 ) allows manglement to utilize AUX carriers to assist on other routes <strong>after completing</strong> their route, so you might get a portion of a regular route to run.
-- As others have posted, AUX carriers only earn annual and sick leave when working the AUX route.