The row at Aer Lingus, which threatened to upset the flotation of the airline, has been resolved.
The problem arose when one section of 14 workers at Shannon Airport withheld support for the company's business plan, effectively exercising a veto over SIPTU's acceptance of the deal.
Airline staff from all unions have also approved new funding arrangements to permit employee shares to be purchased when the flotation goes ahead within the next few weeks.
There were frantic rounds of meetings throughout the day to try to resolve the row which broke out unexpectedly last night.
By this afternoon, 14 workers in the Cargo Clerical section in Shannon were the only group of SIPTU members to reject the deal.
In an attempt to sort out the dispute, Aer Lingus flew a senior human resources executive to Shannon to meet the staff.
Certain union approvals had to be filed with the stock exchange by tomorrow or workers from all Aer Lingus unions could have lost out on millions of euro.
Tonight, after five hours of talks, the airline issued a statement confirming that it has now reached agreement on the business plan with all staff.
Around the same time, unions confirmed that a vote by all airline staff had approved new funding arrangements to purchase employee shares in the company by 84% to 16%.
