Opened in 1986, 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 105,481 m2 (1,135,390 sq ft) and is now home to the SkyTeam alliance, as well as some unaffiliated carriers. It has recently undergone a £200m upgrade to enable it to accommodate 45 airlines with an upgraded forecourt to reduce traffic congestion and improve security. An extended check-in area with renovated piers and departure lounges, a new baggage system installed as well as the construction of two new stands to accommodate the Airbus A380 with Malaysia Airlines and Qatar Airways operating regular A380 flights.[