In fairness Cardiff airport live flight information hasn't kept displaying departures/arrivals for a long period of time after they have landed/taken-off for a while.
You can see most of the sheduled flights i think up to 6-12 hours by clicking the white arrow on the right hand side of the live flight screen.
There did seem a bug however that effected the screen yesterday when the WW2333 picked up a delay. Flight was showing in yellow and delayed up until today even though the flight had departed.
I have managed to get the live flight information on the home page so must be a part of the customise content option.