Do you use SLI ?
- If yes, there's no solution other than enabling the "Disable RTT" option in the Addon Manager, which will surely fix the flickering, but will result in no jetway numbers and no company logos. Changing this option will require a restart of the simulator before you can see the effect.
- If no, are you using a non-standard camera add-on ? The flicker might be caused in this case by a wrong setting in the custom camera configuration.