I didn't realize that purchasing a one-way ticket is against any rules?
The OP is flying LAX-SNN-LAX and he's buying a one-way ticket from BOS to LAX 5 days after his return. AA can't catch ANYTHING since there is NOTHING to catch. The only time AA may be able to figure out that something is not kosher is during the 5 days, but again, I doubt very much their computer system is sophisticated to catch on.....