Richard Kealy training to be a pilot in Florida
The Garda Fraud Squad is probing the collapse of the Pilot Training College that left parents around €5m out of pocket.
The collapse of the Pilot Training College of Ireland (PTC) in July 2012, following a dispute with the Florida Institute of Technology, left hundreds of students in limbo after paying €85,000 up front.
Many were forced to abandon their flight training completely.
The students' parents hope to recoup some money once the liquidation of the company has been completed.
However, they have been warned by solicitors that they stand little chance of getting anything back.
A proposed joint Oireachtas hearing on the issue was dropped without explanation, according to parent Martina Kealy from Castleknock in Dublin, who lost €73,000.
Ms Kealy and her husband Brian remortgaged the family home to pay for son Richard's two-year training course.
When the Waterford college collapsed, they were left with no option but to remortgage the house for a second time to allow him to continue with his studies, this time in Cork.
Ms Kealy said: "My husband has a good job but his salary doesn't cover two remortgages so I now I work too."
Ms Kealy also revealed how one woman used up her life-savings to pay for her nephew's course.
With no prospect of completing his flight training, the woman's nephew decided to emigrate.
"These are the people I am most worried about," she added.
The Irish Aviation Authority (IAA) gave the PTC its flight training license but denies any responsibility towards the students.
However, Ms Kealy claimed it was the IAA's withdrawal of approval for PTC as a flight training organisation, on the basis of their financial position, in July 2012, which effectively ended PTC's training role.
"In our view there were many failings on the part of the IAA in their oversight of PTC," she said.
"We had great hopes when the Joint Oireachtas Committee on Transport and Communication in October 2012 decided in public session to undertake a 'forensic inquiry' into the demise of PTC.