We'll get a look inside Heathrow's new Terminal 2 later. The £2.5b renovation project should be finished by June.
There'll be more natural light and partner airlines will be closer together to improve flight connections. Airport bosses say they're determined not to have a repeat of the chaos when Terminal 5 opened six years ago - with bags lost and long delays.
More information is expected to be revealed later about the future of the site of Heathrow Airport's Terminal Two. A new Terminal Two is expected to open at some point. The old building was demolished three years ago.