Aer Lingus shareholders approved a takeover by British Airways parent IAG at an extraordinary general meeting yesterday.
They passed four resolutions that will allow the €1.3bn (£940m) deal to go ahead.
Earlier this week, the European Commission cleared the way for the takeover and US Department of Justice has also rubber stamped it.
Under the conditions, IAG will have to give up five daily slots at Gatwick.
Ryanair has already confirmed it will be bidding for some of these slots.
IAG has also entered into agreements with rival airlines that operate long-haul flights out of the UK, the Netherlands and Ireland committing Aer Lingus to providing them with connecting passengers.
