The mother of Harry Dunn has told Sky News "sorry just doesn't cut it" ahead of a potential meeting with the woman involved in the crash that killed him.
Parents Charlotte Charles and Tim Dunn are travelling to the US after the Foreign Office said that Anne Sacoolas, the wife of an American diplomat, no longer has diplomatic immunity because she has returned home.
Mrs Sacoolas has said she wants to meet to "express her deepest sympathies and apologies" after the fatal accident outside an RAF base in Northamptonshire in August, but Ms Charles said "that's not really quite enough".
Ahead of her departure from the UK, Ms Charles told Sky's Lisa Dowd: "My opinion on Anne Sacoolas now wanting to come forward and say sorry – to be perfectly honest, yes it's the start of some closure for our family.
"Having said that, as it's nearly seven weeks now since we lost our boy, sorry just doesn't cut it.
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"That's not really quite enough. But I'm still really open to meeting her, as are the rest of us. I can't promise what I would or wouldn't say, but I certainly wouldn't be aggressive."
Mr Dunn added: "So after thinking about the letter, obviously we were right from the start. So here we are, about to get on the plane at Heathrow to go to America.
"Still apprehensive because, you know, this thing has been up and down, up and down.
"Hopefully we'll get the answers we are seeking."
Harry, 19, died when his motorbike collided with a car outside RAF Croughton on 27 August.
Mrs Sacoolas, 43, was involved in the crash but returned to the US after being granted diplomatic immunity, prompting the grieving family to make a public appeal for her to return.
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Her lawyer Amy Jeffress has since said Mrs Sacoolas is "devastated by this tragic accident" and that she "extends her deepest sympathy" to the family.
In a statement released on Saturday, she added: "The media reporting has been inaccurate in many respects. To begin with, Anne fully co-operated with the police and the investigation.
"She spoke with authorities at the scene of the accident and met with the Northampton police at her home the following day. She will continue to co-operate with the investigation.
"Anne would like to meet with Mr Dunn's parents so that she can express her deepest sympathies and apologies for this tragic accident. We have been in contact with the family's attorneys and look forward to hearing from them."
Ms Charles and Mr Dunn had expressed anger and disappointment at how the UK government had handled the case following a meeting with Foreign Secretary Dominic Raab.
But on Saturday they received a letter to say that Mrs Sacoolas no longer has diplomatic immunity, and that the case could now be taken forward by Northamptonshire Police.
Mark Stephens, the lawyer representing the family, told Sky News that Mrs Sacoolas "was very ill-advised" to have left the UK and said that it had caused "untold additional grief and hurt".
"The most important thing for Dunn family is not whether she's prosecuted or not, they need to see her, talk to her about last moments of their son's life so they can get closure," he said.
"They have been denied that by her fleeing jurisdiction.
"Mrs Sacoolas had her 10-year-old son strapped into the front seat of her vehicle and that would have been a traumatic experience for her son, and I'm sure the Sacoolas family are dealing with matters that are tragic as well.
"There is a basis for having a human meeting, it has to be in private, just mum, dad and Mrs Sacoolas, and they can ask the questions and get the answers both sides think they need."