If you charge your AS tickets to your AS Visa, you'll get 1000 bonus per ticket, and if you book them as one ways, that means 1000 bonus in each direction, which means 5x2x1000 = 10K bonus miles for 5 RTs. Note - if using the companion ticket, that won't work because you need to book the RT at once. (You can use the companion ticket for a OW fare, but that won't get you home!)

If you end up with low tier AS status, it will give you some perks on both DL and AA, as opposed to your AA status just giving you some perks on AS. However, you will lose your Oneworld Quartz status (or whatever not really valuable gem their lowest tier is called).