As per 10FEB12 GDS inventory display, China Southern since Thursday (09FEB12) has opened reservation for its 3 weekly Guangzhou – London Heathrow service, due to start from 06JUN12.
The Skyteam member loaded the flight information on 16DEC11, however it did not open reservation until yesterday.
CZ303 CAN0900 – 1525LHR 332 357
CZ304 LHR1825 – 1325+1LHR 332 7
CZ304 LHR2230 – 1730+1LHR 332 35