In 2026, Delta Air Lines remains relatively moderate compared to ultra-low-cost carriers, but they have tightened enforcement on "full" flights. Delta does not have a formal weight limit for carry-on bags (except in certain international hubs like Singapore or Beijing), but the bag must fit within the 22×14×9 inch (56×35×23 cm) dimensions. Gate agents are instructed to be stricter when a flight is at "100% capacity," often requiring passengers in later boarding groups (like Basic Economy) to gate-check their bags if the overhead bins are full. However, Delta is famously generous in that they allow one carry-on plus one personal item even for Basic Economy passengers, which distinguishes them from United or JetBlue. To avoid scrutiny, ensure your personal item fits entirely under the seat, as agents are more likely to flag you if both of your bags appear to require overhead bin space.