Terminal 4 is situated to the south of the southern runway next to the cargo terminal, and is connected to Terminals 1, 2 and 3 by the Heathrow Cargo Tunnel. The terminal has an area of 105,481m2. From November 2009, it will become the Heathrow base for airlines of the SkyTeam alliance.
Terminal 4 has undergone a £200m upgrade to enable it to accommodate 45 airlines and serve as the base for the SkyTeam alliance. The forecourt has been upgraded to reduce traffic congestion and improve security. An extended check-in area and renovated piers and departure lounges are nearing completion. Two new stands to accommodate the Airbus A380 are being constructed, and a new baggage system is being installed