No there was no T4
ever there however T4
will be built around the plant next to T3
so this is the rundown;
Terminal 1 - United and Star
Terminal 2 - United and Star
Terminal 3 - American and oneworld
New - Terminal 4 - American and oneworld
International Terminal 5 - Conversion to a General Airline Terminal
New - Terminal 6 - General Airline Terminal
New - West Terminal - General Airline Terminal - Possible new Hub Terminal
All terminals will have customs facilities finally
Elgin-O'Hare expressway will be extended from the Lake Ave.-Route 53/I-290-Eisenhower Expressway to a Lake Ave.-York Rd./West Terminal End. The Metra STAR Line Terminal will be built into the area of the West Terminal. STAR Line will be an O'Hare-Woodfield Mall-Hoffman Estates-Joliet Train Line to be built. ATS will have an extension from T2
to the West Terminal as well. the Rent A Car area will also get an ATS stop and new parking garages will be built as well.
This will all happen on top of the Runway reconfiguration.