Esme Sparks, 38, from Darlington, lost her father, Major Gary Sparks, when aged seven after the Chinook helicopter crashed on the Mull of Kintyre on June 2, 1994.
The teacher and mum joined the Chinook Justice Campaign in 2024, to push for answers about what happened to her dad.
Major Gary Paul Sparks,with daughters Esme (right) and Lucy and son Paddy (Image: Chinook Justice Campaign)
The aircraft was en route from RAF Aldergrove in Northern Ireland to Fort George near Inverness when it went down, killing 25 intelligence experts and four special forces crew.
The incident was initially blamed on pilot error before that finding was overturned in 2011. Families have long campaigned for a judge-led public inquiry and for all files - some sealed for 100 years - to be released.
On Tuesday (December 16), representatives of the Chinook Justice Campaign met defence minister Lord Vernon Coaker, armed forces minister Al Carns and veretans minister Louise Sandher-Jones in London to present their case.
Esme said: "I think we were all a bit apprehensive this morning about how we were going to be received. But that apprehension has turned into optimism.
"There seems to be a light at the end of the tunnel in terms of the evidence and the sealing of the documents for hundreds of years. I don't think some of them realised the level of evidence we had."
Chinook Justice Campaign representatives and family members ahead of a ministerial meeting at Parliament, Westminster, London. (Image: Chinook Justice Campaign/PA Wire)
Families of the victims previously said they wanted Sir Keir Starmer himself to attend the meeting.
In October, relatives handed a letter to Downing Street demanding answers.
However, the Ministry of Defence has said the crash has already been the subject of six inquiries, including an independent judge-led review, but campaigners left the meeting wondering why their call was pushed back if there were still unseen documents.
Esme added: "We've already got so many pieces of evidence to back us up, so we want to know what else was in those files as well. What else might reveal why they were on that flight that day.
"We've been told the documents have been reviewed and there isn't anything extra, but today it was evident that there were things that we have as a group that maybe not everyone was aware of.
"We'd love to meet with the Prime Minister. We've opened that doorway so it would be great to have a meeting with him now. It's little steps all the time."
The Chinook Justice Campaign launched a petition which has been signed by more than 52,000 people, calling for a public inquiry.
"It isn't just us who are saying this isn't right," added Esme.
"The government should be truthful and transparent. It just keeps on growing and we're getting more publicity each day, so they really should allow the inquiry to take place."
File photo dated 04/06/94 of the wreckage of the RAF Chinook helicopter, which crashed on the Mull of Kintyre on June 2, 1994. (Image: Chris Bacon/PA Wire)
Speaking after Tuesday's meeting, Lord Coaker reassured relatives that ministers had committed to continued engagement with the campaign.
He said: "The loss of so many brave and dedicated personnel and civilian staff in the Mull of Kintyre crash was a tragedy.
"Today's meeting was an opportunity for me and my ministerial colleagues to hear first-hand the concerns of the relatives and campaign group members.
"I recognise the agony of those who lost loved ones and understand that the lack of certainty about the causes of the crash has added to their distress.
"We have committed to continued engagement with the Chinook Justice Campaign."