Aer Lingus has appointed Ictu general secretary David Begg as a non-executive director to its board.
Mr Begg has served as a director nominated by Aer Lingus's employee share ownership trust (Esot) since 2008.
However, following last year's decision by the airline to pay Esot €25.3 million to clear its debt, it distributed shares to its 4,700 members.
As a result, the Esot shareholding fell below the percentage threshold that entitled it to nominate any directors to the board.
Aer Lingus also announced Michael Johns will retire as an Esot nominated director from February 28th.
The airline's chairman thanksed Mr Johns for his contribution, and welcomed the reappointment of Mr Begg to the board.