The availability for the 0905 departure from JFK on 21 March is
JFK 9:05a → LHR 7:50p
F2 A1 J9 C3 D0 R0 I0 W9 E0 T0 Y9 B9 H9 K9 M9 L7 V4 S1 N1 Q0 O0 G9
you can find out what your selling class is by going in to MMB, clicking on the flight, then clicking on “more flight details”. You should get a pop up which shows selling class towards the bottom.