Yes, you can absolutely bring your own snacks on Delta Air Lines in 2026, and it is highly encouraged for those with specific dietary needs. According to TSA and Delta policies, solid food items like sandwiches, granola bars, fruit, and nuts are permitted in both carry-on and checked luggage. However, if your "snack" is a liquid or gel (such as yogurt, hummus, peanut butter, or salsa), it must comply with the 3-1-1 rule, meaning it must be in a container of 3.4 ounces (100ml) or less. Delta also allows you to bring perishable items like salads or cold meals, but you must use dry ice or gel packs properly (dry ice must be labeled and under 5.5 lbs). Notably, Meals Ready to Eat (MREs) with self-heating elements are strictly prohibited. While Delta still provides complimentary snacks like Biscoff cookies and almonds on most flights, bringing your own food is a "pro" tip for long-haul journeys to avoid high terminal prices. Just remember to be mindful of your neighbors; avoid "smelly" foods like tuna or hard eggs, and be aware of peanut-free zones if a passenger with a severe allergy is seated nearby.