Police have named all the men who died in the helicopter crash in the North Sea. They are:
Richard Menzies (co-pilot), 24, from Droitwich Spa. Worked for Bond Offshore Helicopters
His father said: "Richard was passionate about flying helicopters. He joined a very professional, committed and close-knit family of pilots at Bond Offshore Helicopters.
"I and my daughter Laura and Richard's girlfriend want to express our thanks and support for the hugely professional team at Bond. We have also been grateful for the organisation and support of the Grampian and Mercia Police Forces, the Air Accidents Investigation Branch and the Lord Lieutenant of Aberdeen.
"We visited Aberdeen and queued with others to sign the book of condolence at the Kirk of St Nicholas in the heart of Aberdeen to share our grief with the other families and to support a community which has been devastated by this tragedy.
"We are hugely proud of Richard and the life he led. He was a charming and charismatic man the loss of whom will be felt by many."
David Rae, 63, from Dumfries. Worked for KCA Deutag Drilling Limited
Raymond Doyle, 57, from Cumbernauld. Worked for KCA Deutag Drilling Limited
Nairn Ferrier, 40, from Dundee, worked at KCA Deutag Drilling Limited.
His family described him as a "doting dad and a devoted husband".
His wife, Katherine, said: ''Nairn was just so popular, outgoing and laid back.
"He was a real family man and lived life to its full.
"When he was home from the rigs he would spend all of his time with our two boys Rory, six, and Nairn junior, three."
Gareth Hughes, 53, who lived near Arbroath in Angus, worked for KCA Deutag Drilling Limited as an assistant driller.
The former Royal Marine had worked offshore for the past 10 years.
His daughter Victoria Williams criticised the authorities over the length of time it took to get confirmation he had been on the flight.
Warren Mitchell, 38, from Oldmeldrum, Aberdeenshire. Worked for Weatherford UK Limited
James Costello, 24, from Aberdeen, was contracted to PSN (Production Services Network).
The firm's chief executive officer, Bob Keiller, said he was "deeply saddened" by his death.
"James was a computer enthusiast who started his career in new media development but was eager to join the offshore oil and gas industry," he said.
"He first worked for us in January 2006 in a variety of roles and was a planner on the BP project. His colleagues have paid tribute to a young man's enthusiasm and passion for his job.
"Our deepest sympathies go to James' mother Verona and the rest of his family, friends and colleagues. The oil industry has lost one of its brightest prospects and he will be sorely missed."
Vernon John Elrick, 41, from Aberdeen. Worked for KCA Deutag Drilling Limited
His family said: "It has been of some comfort to us to know that Vernon would have been with work colleagues and friends when he died.
"We would like to thank everyone involved in the search and rescue operation for their efforts. Vernon was to us our big boy with a big heart who had a big appetite for all the good things in life.
"He will be sadly missed by so many, especially us as a family and those many friends he had in Aberdeen and also within his home town of Stonehaven."
Stuart Wood, 27, from Aberdeen, worked for Expro North Sea Ltd.
Expro chief executive officer Graeme Coutts said: "Everyone at Expro is deeply saddened by this tragic event and the loss of Stuart, who was a well-liked member of our team who had a promising career ahead of him."
His family said: "We would like to take this opportunity to thank family, friends and neighbours who have offered support during this time.
"This has been a difficult time and we would like to ask that our family be allowed privacy and consideration to come to terms with these terrible events."
Brian Barkley, 30, from Ballymoney, Co Antrim. He had been living in Aberdeen and worked for KCA Deutag Drilling Limited
His family said: "He was a wonderful son, brother and fiance and to everyone who ever met him he was considered one in a million.
"He would always go out of his way to help people in any way he could. Everyone he dealt with could see his kind heart and we all knew we were blessed and all the richer for having known him.
"He planned to 'grow up' and get married next year and soon after start a family of his own. Offshore was his second home where he thoroughly enjoyed his work. Losing Brian has left the biggest of holes in our hearts."
Alex Dallas, 62, from Aberdeen. Worked for Sparrows Offshore Services Ltd
His family said: "Alex was a wonderful, kind and caring husband and a loving family man who lived and worked all his life for his family.
"The whole family are heartbroken at the tragic way he has been taken from us and he will be missed so much by us all.
"Alex enjoyed working on a variety of offshore installations and had so many colleagues and friends whom he always spoke well of. He really enjoyed his job offshore and the camaraderie of his workmates. Messages from Alex's workmates on the Miller platform and old friends on other rigs will be treasured."
Leslie Taylor, 41, from Kintore in Aberdeenshire, worked for KCA Deutag Drilling Limited.
In an interview with BBC Scotland, his 18-year-old daughter Brogan Taylor said: "He was a really happy person and he was so friendly to everyone."
"He cared a lot about his family."
CAPTAIN PAUL BURNHAM
Paul Burnham (captain), 31, from Methlick, Aberdeenshire. Worked for Bond Offshore Helicopters
James John Edwards, 33, from Liverpool. Worked for KCA Deutag Drilling Limited
Nolan Carl Goble, 34, from Norwich. Worked for KCA Deutag Drilling Limited
Mihails Zuravskis, 39, of Latvia. Worked for KCA Deutag