MCT is the shortest scheduled interval accepted for a defined transfer, not a guarantee that every passenger will comfortably make it.
MCT is a rule for building itineraries
Reservation systems compare scheduled arrival and departure with the applicable minimum. The value can vary by terminal, carrier, flight type and exception; there is no single universal number for an airport.
Valid does not mean generous
The threshold makes a connection saleable under defined conditions. Walking speed, queues, mobility needs, security, immigration and gate closure can require more time.
One ticket changes the recovery path
When protected segments are issued together, the airline normally has a process if disruption breaks the connection. Separate tickets may leave the traveller responsible for rebooking, baggage and new check-in.
A valid ticket and a comfortable transfer are different
A published minimum connection time permits a supported itinerary to be sold under specified conditions. It cannot predict a late inbound aircraft, a long walk, security re-screening or a baggage exception. Compare the actual terminal change and the next available service, especially on the last flight of the day. Separate tickets can leave the traveller responsible for a missed onward flight even when each individual flight is on time.
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