With more than 20 gates, Terminal 3 serves passengers for Delta Airlines, Frontier Airlines, Northwest/KLM, Sun Country Airlines, American Airlines, JetBlue Airways, and Midwest Airlines. Terminal 4 is the airport's largest terminal.
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The terminals are arranged in a circular format that is referred to as The Terminal Loop. Terminals 1, 2, and 3 serve primarily domestic flights, while the International Terminal serves (you guessed it!)
T3 is international terminal and also domestic flight operates,T2 is only for domestic flights. Whichever type of connection you book,there is no way of auto transfer of baggage between terminals,passengers have to collect baggage and re check in at check in counter at next terminal.
British Airways operates from London Heathrow Terminal 3 and Terminal 5, as well as London City, London Gatwick and London Stansted airports. If you're not sure where your flight is departing from or arriving into you can use our Which London airport and terminal tool.
Overall, passengers usually have to re-clear security for connecting flights, though there may be some exceptions depending on the airport and flight itinerary. To make this process easier, checking with the airline or airport ahead of time is recommended.