Son Jonathan Wallis said yesterday the funeral would be in the Alpine Helicopters hangar at noon "followed by lunch for all".
Wānaka Airport duty manager Rushlee Smith said the hangar was next to the runway and airport operations would be arranged to accommodate the wishes of the Wallis family.
There had already been inquiries for parking for corporate jets, and Ms Smith was anticipating some flying activities associated with the funeral.
The Wānaka Volunteer Fire Brigade had offered to help with parking.
Warbirds Over Wanaka general manager Ed Taylor said yesterday he had been fielding calls from all over the world — some to extend condolences to the family and some in preparation for attending the funeral.
George Wallis paid tribute to the team of nurses who had provided his younger brother with round-the-clock care over the last 27 years.
"He’s been well looked after.
"He had a wonderful, wonderful lot of nurses."
Sir Tim was seriously injured when he crashed his Spitfire in 1996 and was largely confined to a wheelchair.
Mr Wallis said Sir Tim was always interested in everything around him.
"He was a people person. He really was; he enjoyed it."
Mr Wallis traced Sir Tim’s entrepreneurial spirit back to their grandfather Alexander Wallis who established a sawmilling business in Southland in the early part of last century.
He had seen native trees cut down and burned to make way for farm land.
Recognising the waste, he began milling the trees and the Wallis family business grew from there.
While Mr Wallis continued in the family business, Sir Tim moved into the fledgling venison industry, and also followed his passion for World War 2-era aircraft — leading to the establishment of the biennial Warbirds Over Wanaka Airshow.
New Zealand Warbirds Association president Frank Parker described Sir Tim yesterday as a "very inspirational man".
"He was a very strong person.
"He had a huge vision for what he wanted to achieve."
Mr Parker said the founding president of the association, the late Trevor Bland, helped Sir Tim set up warbirds shows in the very early days.
Mr Parker said interest in preserving World War 2 planes began in the late 1960s, after many had already been melted down for their aluminium.
Dozens of people posted tributes and condolences to the Wallis family on the Otago Daily Times and Warbirds Over Wanaka Facebook sites.
