It depends on which airline you are travelling with. British Airways leaves from Terminal 5.
Delta uses Heathrow terminal T4.
Yes, there are three stations: Heathrow Terminal's 1,2 &3; Heathrow Terminal 4 and Heathrow Terminal 5. They are all situated on the Piccadilly Line.
Heathrow Terminal 5 is on M 25 motorway.
Terminal 5.
About 20 minutes.
There are about 30 miles from Whitechapel to Heathrow terminal 3.
Terminal 3
American Airlines is located at Terminal 3 at Heathrow Airport.
British Airways is located at Terminal 5 at Heathrow Airport.
British Airways operates from Terminal 5 at Heathrow Airport.
American Airlines uses Terminal 3 at Heathrow Airport.
American Airlines operates from Terminal 3 at Heathrow Airport.