You are absolutely allowed to bring and consume your own food on American Airlines flights, and many passengers choose to do so to avoid buy-on-board costs or to accommodate specific dietary needs. You can bring almost any solid food item—such as sandwiches, fruit, chips, or cookies—through airport security and onto the plane in your carry-on or personal item. The primary restriction is the TSA's "3-1-1" rule for liquids and gels, which means any "liquid-like" foods (hummus, yogurt, peanut butter, or soups) must be in containers of 3.4 ounces (100ml) or less and fit into a single quart-sized clear bag. If you purchase food after passing through security, there are no size limits, and you can bring it directly onto the aircraft. While American Airlines is generally "nut-friendly" and allows passengers to bring peanuts, it is worth noting that they cannot provide "nut-free zones" for those with severe allergies. Additionally, while you can bring your own snacks, you are strictly prohibited by FAA regulations from consuming your own alcohol on board; any alcoholic beverages must be served to you by a flight attendant or other airline employee.