Terminal 1 opened in 1968 and was formally inaugurated by Queen Elizabeth II in May 1969. Before Terminal 5 opened, Terminal 1 was the base for British Airways' domestic network from Heathrow and for a few of its long haul routes. With BMI’s merging into BA, Terminal 1 has once become a major terminal for British Airways for the time being.In 2005, substantial redesign and redevelopment of the terminal saw the opening of the new Eastern Extension, doubling the size of the departure lounge and creating additional seating as well as retail space. This modern terminal is home to Heathrow's second largest carrier, BMI which is becoming British Airways followed by the sale to Lufthansa, Aer Lingus, and several other Star Alliance airlines such as Aegean, Air New Zealand, Asiana, Austrian, Brussells, Croation, Cyrpus, El Al, LAP, TAM Brazil, Thai, and United. Some of the newer boarding gates used by airlines present in Terminal 1 are numbered in Terminal 2. Those recently built gates will be retained as part of the new Terminal 2 after Terminal 2 officially opens. A temporary connector is in place between the older Terminal 1 and these recently built gates.Terminal 1 will be closed and then demolished around 2013–14, in preparation for construction of the 2nd phase of Terminal 2, scheduled for completion in 2019. There are no plans to re-use the Terminal 1 name. Some infromation courtey: Wikkipedia