A 1.5-hour layover is generally considered "sufficient" but "tight" for a luggage transfer, depending heavily on the airport and the nature of your ticket. If you are on a single booking (one ticket for both flights), the airline's baggage handling system is designed to prioritize "hot transfers" or short connections. In major hubs like Munich or Zurich, this is plenty of time. However, in sprawling airports like London Heathrow or JFK, 90 minutes leaves very little margin for error if your first flight is delayed by even 15 minutes. If you are traveling internationally and must clear customs/re-check your bags (common when entering the U.S. from abroad), 1.5 hours is very risky and likely not enough. If you booked two separate tickets on different airlines, 1.5 hours is almost certainly impossible, as you would need to exit, wait for your bags, check them in again, and clear security. To mitigate risk, use an AirTag to track your bag's location and always ensure your luggage is tagged all the way to your final destination at the initial check-in counter.