Twice. First with AF JFK/CDG in 1988, flying time 3.18; and 2/92 LHR/JFK on BA. Lv. LHR 10:40AM/Ar. JFK 9:10AM (flying time 3.30) Used a "75AD" on AF (75% off full fare), and BA trip was part of a travel agent "fam" trip put together by the British Tourist Authority and BA. Terminal 4 at LHR seemed so new at the time!