AA's practice is no different than other major carriers. In a major storm, it will fly its aircraft away from the affected stations. In other words, AA won't risk having a widebody stcuk for 2-3 days in a storm system, so this is not a question of whether the MCO or MUC flights go.
On the other hand, there is no suggestion as of yet that this is one of those situations and since there is no such suggestion, trying to figure that out is not even worth a second's thought.
The only solid thing to do is to leave Monday, but you say that you can't do that. So, barring a Monday departure, just hang in there and be ready to be flexible.