The airport, known then as the Western Junction Aerodrome, is Australia's third oldest commercial airport and the first government aerodrome in the state.

At the 90th birthday celebration Miss Flinders - the plane used by Lawrence Johnson to fly passengers to Flinders Island for the first time in 1932 - was unveiled, and is to remain at the airport as homage to aviation history.

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The plane was previously displayed at the airport before it was transferred to the Queen Victoria Museum and Art Gallery, but is now back home.

Tasmanian Aero Club historian Lindsay Miller said the day marked a significant milestone in Tasmanian aviation history.

"It's just great to have the original aircraft that initiated a major airline in Australia back in Tasmania where it belongs, and back on the same aerodrome where it started its career," he said.

Launceston Airport chief executive Hans van Pelt said when the airport originally opened, it was the "jewel of the city".

He said the airport had come a long way over the decades.

"In our inaugural year there were just six flights a week and when there's no travel restrictions we offer travellers up to 400 weekly flights to five non-stop destinations."

Mr van Pelt said he was pleased to unveil Miss Flinders for guests to enjoy.

"The plane represents our proud history of connecting Northern Tasmania to the mainland."

Tasmanian Aviation Historical Society president Andrew Johnson, and grandson of Lawrence Johnson, said Miss Flinders was one of only three left of her kind in existence.

"Miss Flinders was used to transport passengers and mail, but also undertook the first medical evaluation from Flinders Island in 1932," he said.

Transport Minister Michael Ferguson also attended the event.

"Launceston Airport was then [in 1931], and is now, the principal aviation gateway for Northern Tasmania."

Mr Ferguson said the addition of Miss Flinders at the airport was part of the legacy, history, and future - inspiring new generations.