Unions at Aer Lingus say they are "not convinced at all" that a takeover bid from International Airlines Group (IAG) should proceed.
Representatives of Unite, SIPTU, Impact and ICTU met with IAG chief Willie Walsh today, to discuss the future of jobs at the airline.
The unions say promises of job creation made by Mr Walsh were 'unspecific'.
Mr Walsh admits the unions still have questions - and he's happy to meet them again in the future.
Liam Berney of ICTU says Mr Walsh's promise to grow the business is not enough to convince them.
SIPTU divisional organiser, Owen Reidy, attended the meeting in Dublin. He told Newstalk Lunchtime they want IAG to sign up to a legally binding agreement.
Around 20 representatives of SIPTU, Impact and ICTU asked Mr Walsh about how new jobs would be created at the airline if an IAG takeover is successful.
Aer Lingus CEO Stephen Kavanagh was also in attendance.
The unions had previously warned they will not give the sale their backing unless they get cast-iron guarantees about employment terms and conditions.
Mr Walsh - himself a former union representative at Aer Lingus - has previously said administration jobs would be lost, but that more jobs would be created among air crew and mechanics.