Flight delay unable to trace flight no.

FOXXYLADY

We booked a holiday to Northern Cyprus back in 2009. The flight was to Ercan and we were delayed 11 hours due to our plane having developed a fault and was unable to fly from Ercan back to Gatwick to pick us up. I know the flight time and date that it should have flown but have no paper proof. I have been onto the flightstats website and the flight number is shown as YK 976. I believe this means that the original flight co. put the flight out to someone else. Can you please let me know if anyone knows how I can find out the name of the company that took the flight otherwise I cannot claim.

Caz3121

YK is the code for Cyprus Turkish Airlines which went bust in 2010 (they flew between Ercan and UK)