Another observation I made:
While the fare list populated on EF shows "U" to be the lowest fare class, I can see a couple of fare classes even lower when I look for the flight availability. So for instance:
EK () 56 0 DUS
23/02/11 14:40 DXB
23/02/11 23:59 773
Daily
0% / 57m F2 A2 J4 C4 I4 O7 Y7 E7 R7 W7 M7 B7 U7 K7 H7 Q7 L7 T7 V7 X7
It shows that K, H, Q, L, T, V and X are lower. So why are they not listed in the populated fare overview?