AA - one trip only LHR-NYC
BA - go-to airline being UK based.
CX - 2/3 trips per year for a decade+
JL - KUL-SIN twice and Domestic in Japan once.
MH - UK to Australia & Indonesia a few times.
QF - SYD-HKG once and a couple of Domestic flights.
QR - as per CX & MH.
RJ - HKG-BKK in Business and a weekend away from LHR to AMM.