https://phys.org/news/2018-07-airbus-fetes-flight-whale-sky.html

The A330-743L Beluga XL has grown six meters (20 feet) longer and one metre wider from the Beluga ST, stretching its carrying capacity by 30 percent.

Airbus says that at 19 metres tall the plane is as big as a three-storey house and can carry up to 51 tonnes of cargo, the equivalent of seven adult male elephants—though animals cannot be transported because the hold is not pressurised.