Some staff at Dublin Airport are threatening to take industrial action over problems with the payment of their wages, a trade union has said.
Siptu said there had been consistent irregularities in the payment of staff over the past nine months.
Thousands of airport workers due to be paid on Wednesday did not receive their money on time, said the union.
Dublin Airport said pay had arrived in workers' accounts "a little later in the day than normal".
It said that as soon as it became aware there was a problem it informed all staff and apologised for the stress or inconvenience.
Siptu worker representatives employed at Dublin Airport have declared no confidence in management and are preparing to ballot members for industrial action.