The aircraft involved in the incident was A6-EWC.
The flight departed DXB at 17:25 and is due to arrive around 00:50 local into IAH. The flight suffered such a long delay because the next free aircraft (B77L) was not available until then. In fact A6-EWH which operated the EK415 from SYD, arrived into DXB at 14:14 and then turned around to operate the delayed EK211.
A6-EWH was originally scheduled to operate EK953/954 to BEY but this aircraft was changed and operated by A6-EMK (a B777-200ER) instead.
Rgds
Emirates777