British Airways' fleet of 777s is quite finely diced into several configurations, although as far as the Heathrow based aircraft are concerned, there is movement towards consolidating the fleet into three types through a programme of fleet refurbishments.  So, by the end of 2022, the Heathrow fleet will comprise of three surviving configurations: the three class 200ER (77L), the four class 200ER (77M), and the four class 300ER (77H). 

The London Gatwick fleet is fitted out in three separate cabin configurations: the four class 200ER (77R), plus two three class types (77S and 77T)

If you need any assistance pin-pointing the correct corresponding 777 type, there are several tips you can follow in our BA 777 Cabin Layout Recognition article

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