In December 2013, The merger between American Airlines and USAir became official. They are presently working to consolidate their systems.
Here’s what’s currently on USAir’s website:
We recognize that some of our passengers are allergic to peanut products. However, because of last-minute aircraft changes and the possibility that other passengers may have peanuts, we cannot guarantee that no peanut products will be on board. Also, we cannot accommodate ‘peanut-free’ snack requests, and meals may contain peanuts or peanut-related ingredients, so we encourage you to bring your own food items on board if you’re allergic to peanuts.