The Alinghi Americas Cup Catamaran would be a strong competitor:
The ship has dimensions of 35m x 25m x 4m and a flying weight of 12tonnes. It was slung by a Mil Mi-26 from Lake Geneva (Switzerland) climbing to 3000m (!) over the Alps to Genua (Mediterranean).
The mast of the Catamaran (fully carbon composite, 60m long, 2.7tonnes) was slung with a Superpuma the same routing:
Both had to land in Italy for intermediate fuel stop:
Rumor sais, the process of design, research and construction took overall about 90 million Euros...
walter