Yes Airbus, but only just, mainly because of the huge amounts of BA
320s/319s, which are undoubtably the most common aircraft in any one livery to be seen at LHR
(too many for us spotters
). Other reasons include the ever expanding VS
Airbus fleets, and new carriers operating in with Airbus widebodies such as Etihad.
Boeing easily outperforms Airbus in terms of widebodies, 747s and 777s everywhere. However there are more short haul flights ex-LHR
than long haul, and with so many European carriers operating Airbus short haul these days there are more Airbus a/c operating ex LHR
Once you have tasted flight, you will walk the earth with your eyes turned forever skyward