Make Your Connection: The Airport Layover Guide
One Ticket Changes Everything
The term "minimum connection time" (MCT) is the shortest interval an airline can legally sell between your arrival and your connecting departure. It is not the interval you will comfortably make. It is the floor that booking systems enforce, and at large airports it often falls well short of what you actually need. The single most important fact about MCT: it only protects you when both flights are on one booking reference. Book two separate tickets to save money and the second airline owes you nothing when the first runs late. On a single booking, the airline is responsible. If their inbound flight causes you to miss the connection, they must rebook you at no charge.
Four Connection Types and What Each Means
Every airport uses the same four codes. Knowing which type your layover is tells you what to expect on the ground. D to D (domestic to domestic): Both legs stay within one country and one security zone. No passport control, no customs. The fastest connection type. D to I (domestic to international): You depart internationally. At U.S. airports this usually means a terminal change and a second security check at the international pier. I to I (international to international): Both legs are cross-border. In the Schengen Area, this is nearly as fast as a domestic connection because passport control happens only once, at the first Schengen entry. Outside Schengen, allow more time. I to D in the U.S. (international to domestic): The hardest connection at U.S. airports. You must clear customs, collect checked bags, re-check them, and pass through TSA. Three hours is a realistic minimum at JFK or ORD.
Domestic to Domestic (D to D)
60 to 90 min recommended minimum
Domestic to International (D to I)
90 min to 2 hours
International to International, Schengen
60 to 90 min
International to International, outside Schengen
90 min to 2 hours
International to Domestic in the U.S.
2.5 to 3 hours minimum
Self-transfer on separate tickets, any type
3 to 4 hours minimum
Hub by Hub: Published Floor vs. What You Actually Need
Published MCT is the airline-bookable minimum. The "aim for" figure is the margin that gives you a realistic buffer at each airport's true pace. As of October 2026.
JFK D to D
Published 45 min. Aim for 90 min (no airside links between terminals).
JFK I to D
Published 120 to 135 min. Aim for 3 hours (customs, AirTrain, TSA).
LHR I to I same terminal
Published 75 min. Aim for 90 min.
LHR I to I terminal change
Published 90 min. Aim for 2 hours.
CDG I to I within Terminal 2
Published 90 min. Aim for 90 min.
CDG I to I between terminals
Published 90 min. Aim for 2 hours.
AMS any connection type
Published 40 min. Aim for 60 min (single terminal).
DXB I to I Terminal 3 only
Published 45 min. Aim for 60 to 75 min.
DXB T1 to T3 transfer
Published 60 min. Aim for 90 min or more.
ATL D to D
Published 55 min. Aim for 60 min (airside via Plane Train).
ATL I to D
Published 90 min. Aim for 90 min (customs, Plane Train, recheck).
ORD D to D
Published 40 min. Aim for 75 min (construction delays in 2026).
ORD I to I
Published 90 min. Aim for 2 hours.
AMS is the easiest major hub: a single-terminal design means Schengen arrivals reach a remote gate in under 30 minutes. ATL is the best U.S. option: every concourse links airside via the underground Plane Train, so the 55-minute MCT is one you can actually hit.
What Happens to Your Checked Bags
On a single ticket, D to D: the airline checks your bags through to the final destination. You do not touch them at the connection. On a single ticket, I to I within Schengen: bags go through to the final destination. You clear passport control at the first Schengen entry; bags clear customs at the end. On a single ticket, international into the U.S.: U.S. CBP requires you to collect every checked bag at the first port of entry, carry it through customs, and re-check it at a designated belt. This is mandatory even if the tags say your final destination. Build at least 2.5 hours.
Bags on Separate Tickets and the 2026 Pilot Exception
On separate tickets: you must collect your bags, exit the secure area, and re-check them yourself regardless of connection type. No airline transfers bags between separate bookings automatically. 2026 exception: Delta and United are running pilot programs on selected routes where remote baggage screening allows international bags to reach the domestic connection without manual recheck. Delta covers Atlanta from London Heathrow. United covers several hubs. This applies only to enrolled routes. Confirm with your airline before you rely on it.
When Your Connection Starts Looking Shaky
If your inbound flight is running late and the margin is shrinking, do these things at the same time, not one after another. Open the airline app while still on the plane. Many carriers (United, Delta, American, Lufthansa) automatically rebook passengers on delayed legs before the plane lands. The new flight sometimes appears before you touch down. Call the airline if inflight Wi-Fi is available. The phone queue is shorter than the transfer desk queue on the ground. Once doors open, walk at full speed toward your gate.
At the Gate and After
If the connecting gate door is already closed, go immediately to the transfer desk (not immigration, not baggage claim). Ask them to rebook you and confirm where your checked bag will go. Flight attendants sometimes hold the boarding door for passengers they know are on a feeder flight that ran late. It is worth asking the gate agent as you land. Keep every receipt for food and accommodation. On a single-ticket, airline-caused missed connection you are entitled to a meal voucher and, for overnight waits, a hotel under U.S. DOT rules and EU EC261.
Door closed at your connecting gate
Go to the transfer desk, not baggage claim.
Airline at fault, U.S. route
Free rebooking plus meal voucher at minimum.
Airline at fault, EU route
Free rebooking plus up to 600 euros under EC261.
Overnight wait, either region
Hotel and transport required under DOT and EC261.
Separate-ticket missed connection
No automatic protection. Rebook at your cost.
Do not leave the transfer desk until you have a hotel voucher or written confirmation of hotel reimbursement. Verbal promises are not guaranteed at the point of claim.
Three Rules for Every Connection
Buy on one ticket. The fare gap between two separate bookings and one itinerary is rarely worth losing all protection on a missed connection. MCT only applies when the airline sold you the full itinerary. Carry what you cannot lose. Medication, a wedding outfit, work equipment: carry-on only. On a tight connection there is no time to retrieve a bag and no guarantee the airline routes it correctly to a later flight. Treat the published MCT as a floor, not a target. Amsterdam at 40 minutes and JFK at 45 minutes for domestic connections look similar on paper. They are not. JFK has no airside links between terminals. Fewer than half of passengers make a 45-minute JFK connection when the inbound is ten minutes late.
