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.
Reconsider travel to Egypt due to terrorism. Exercise increased caution in Egypt due to the Embassy's limited ability to assist dual national U.S.-Egyptian citizens who are arrested or detained. Do not travel to: The Sinai Peninsula (with the exception of travel to Sharm El-Sheikh by air) due to terrorism.
Terminal 3 is used by the majority of the members of the Oneworldairline alliance: American Airlines, Cathay Pacific, Finnair, Iberia, Japan Airlines, Qantas, Royal Jordanian, and SriLankan Airlines. British Airways, which mainly uses Terminal 5, also offers some flights from this terminal.