Longreach aerodrome. What’s a jumbo doing there. It has been donated to the Qantas Museum by Qantas and must be one of the largest museum object in the world. But what of its long term future. How will it be conserved. And what of public access.

Update: January 2020.
I have recently been contacted by Chris Dudar who works at the National Museum of Natural History, Washington. He has pointed out that Howard Hughes ‘Spruce Goose’ is the largest museum object inside a museum with a length of 66.6 m. it is housed in the Evergreen Aviation Museum in McMinnville, Oregon. The Boeing 747 has a length of 76 m but it is outside so does it properly qualify as a museum exhibit? Regardless of what constitutes a museum exhibit/object, both are very large.