A 30-minute layover is a "High-Fidelity" risk for checked luggage, and the probability of your bag making the connection is low, even at efficient hubs. While an athletic passenger can sprint between gates, the physical journey for a suitcase involves unloading from the first aircraft, being sorted through the airport's automated belt system (which must scan the tag and route it to the new pier), and being manually loaded onto the second plane's cargo hold. Most major airlines have a "Minimum Connection Time" (MCT) of 45 to 60 minutes specifically to protect the baggage manifest. If your first flight is even five minutes late, the baggage handlers will likely be unable to clear the security and loading window before the second plane's "doors closed" time. In 2026, if you find yourself with a 30-minute gap, the safest strategy is to use carry-on only or prepare for your checked bag to arrive on the "next available flight," which could be several hours or even a day later.