British Airways revolves around London Heathrow Airport (LHR). The airline’s schedule submission to Cirium Diio shows that 80% of services are to/from the UK’s busiest airport. Of course, departures from London City Airport (LCY) involve BA CityFlyer, while most from London Gatwick Airport (LGW) use BA Euroflyer. CityFlyer also operates some services from regional UK airports.