I am planning a vacation in a few months to meet my husband at a conference in San Diego. Unfortunately, there is a chance that I will have a work trip the preceding week, meaning my travel plans are up in the air. If I do have a work trip, what would likely happen is I will go on my trip, and then work will pay to "return" me to San Diego rather than home, since it's closer. If I go this route, that would mean I would need to cancel the DCA->SAN leg of my personal trip but keep the SAN->DCA leg, and I would have a couple weeks notice to do so.
I would like to book my personal travel soon, while the prices are still reasonable, and since my work plans are not solidified, I would prefer to purchase both legs. The prices for booking two one-way trips on the same airline (AA) and a single round trip are essentially the same. Since there is the potential I will have to cancel the outbound leg, does it make more sense to purchase the round trip or the two one-ways?
I've already seen this question about round trip vs. two one-ways in the general case, but it doesn't address the issue of potentially having to cancel one leg in advance.