In 2026, you can absolutely take a Starbucks cup on a plane, but the timing of your purchase is critical due to TSA 3-1-1 liquid restrictions. You cannot bring a full cup of coffee through the security checkpoint because it exceeds the 3.4-ounce (100ml) limit. You must either finish it, dump it, or bring an empty reusable cup to fill later. However, once you have cleared security, you are free to purchase a drink at any terminal Starbucks and carry it directly onto your flight. Most airlines consider this a "personal item" convenience and do not count it against your baggage allowance, provided it has a secure lid to prevent spills during boarding. In 2026, many frequent flyers bring their own empty insulated mugs through security and ask the airport barista to fill them, which is both eco-friendly and better at keeping your latte hot during a long taxi on the runway.