One of the most successful aircraft in the BA fleet is the 747-400. Here are some routes that have been operated by it:

Key:
C = Used to be used on route but was Cut
CC = Cargo only
O = Still operating
T = Entire route Terminated

Buenos Aires / C
Adelaide / T
Brisbane / T
Melbourne / T
Perth / T
Sydney / C
Bahrain / C
Dhaka / CC T
Rio de Janeiro / C
Sao Paulo / C
Montreal / C
Toronto / C
Vancouver / O
Santiago / C
Beijing / O
Hong Kong / C
Shanghai / C
Cairo / C
Accra / O
Bangalore / C
Chennai / C
Delhi / C
Hyderabad / C
Mumbai / C
Nagoya / T
Tokyo / C
Nairobi / C
Kuwait / O
Mexico City / C
Auckland / T
Christchurch / T
Lagos / O
Islamabad / C
Manila / T
Doha / C
Singapore / C
Cape Town / O
Seoul / C
Taipei / C
Dubai / C
London / O (duh!)
Boston / O
Las Vegas / O
Los Angeles / O
Miami / O
New York JFK / O
Pheonix / O
San Francisco / O
San Diego / O
Caracas / T
Harare / T