Appears the last 3 Class flight according to the GDS is on the 31th December 2015, with the flight on the 1st Jan 2016 being operated by a two class service.
31DEC THU BHX/Z DXB/‡4
1EK42 F2 A2 J4 C4 I4 O7 P0 BHXDXB 820A 710P DCA /E
Y7 E7 R7 W7 M7 B7 U7 K7 H7 Q7 L7 T7 V7 X7
2EK40 J4 C4 I4 O7 P0 Y7 E7 BHXDXB 115P 1230A‡1 DCA /E
R7 W7 M7 B7 U7 K7 H7 Q7 L7 T7 V7 X7
3EK38 J4 C4 I4 O7 P0 Y7 E7 BHXDXB 830P 715A‡1 DCA /E
R7 W7 M7 B7 U7 K7 H7 Q7 L7 T7 V7 X7