Coventry man, 80, skydives in memory of son killed in crash
Mr Cassidy decided to challenge himself to raise funds for his local Warwickshire and Northamptonshire Air Ambulance (WNAA) service.
"I don't feel any fear whatsoever," he said.
"I feel a bit nervous for God's sake, I mean I'm no spring chicken. But I'm going for it.
"The air ambulance - because of their professionalism and their care - they got him to Hull Infirmary," he added.
"They receive no government or National Lottery funding and rely on the support from the local community to raise the vital funds needed."
WNAA executive Amy Worthington thanked Mr Cassidy for his contribution and praised his "tremendous bravery and determination".
"What an amazing achievement for him to be able to say that he completed a skydive at 80 years old,” she added.
Donations to Mr Cassidy's online fundraiser have surpassed £800.