Fianna Fáil says serious safety concerns by air traffic controllers "cannot be whitewashed" by the Irish Aviation Authority.
Up to 160 staff have written to the government claiming they're being pressurised to work through fatigue by managers struggling to fill their rosters.
The Irish Aviation Authority is denying everything raised in the letter, and says safety has not been compromised.
Fianna Fáil's Timmy Dooley says too many air traffic controllers have signed it to be ignored
