Generally, 35 minutes is extremely risky and is often below the "Minimum Connection Time" (MCT) for most major airports. While some airlines may sell this itinerary (particularly at small regional hubs or if both flights are in the same terminal), it leaves zero room for error. If your first flight is even 10 minutes late, or if you have to change terminals, go through a security rescreening, or wait for a slow deplaning process, you will likely miss your connection. Most airlines begin boarding 30 minutes before departure and close the jet bridge 10 to 15 minutes before takeoff. If you are on an international itinerary where you must clear customs or immigration, a 35-minute connection is virtually impossible. For a stress-free journey, you should aim for at least 60 to 90 minutes for domestic connections and 2 to 3 hours for international transfers to ensure you and your luggage both make it.