This bit confused me a little bit, is that their estimate they use for calculating fuel consumption
An aircraft needs to carry enough fuel to reach its destination plus a safety margin. It is uneconomic to carry more than that as it adds to the weight of the plane so you end up burning more fuel. An average airliner weighs around 41 tonnes and carries up to 18 tonnes of fuel, so the weight of fuel is significant. As fuel is a major cost for an airline, they want to keep their fuel bill as low as they can. So they use the passenger load to estimate the weight of passengers they are carrying, add that to the weight of luggage in the hold and an estimate of hand luggage. That then gives them the overall weight of the load they are carrying, allowing them to calculate how much fuel they will need to get to the destination. If passengers actually weigh more than the estimate they will have less safety margin than intended. On the other hand, if passengers weigh less than the estimate they will take more fuel than they need, increasing the airline's costs.
Finnair have been weighing passengers in Helsinki for the last 2 years for this reason. They won't refuse to allow passengers to fly because of their weight. They will simply use the data to make sure they get the right amount of fuel on board.
Obviously bollocks. It's in the Sun fgs
As I say, Finnair have been doing this in Helsinki for a couple of years. Hawaiian airlines also weigh passengers travelling to or from American Samoa. Many in the industry believe other airlines will follow.
Clearly the sun has never heard of the Equality Act
Weight is not a protected characteristic. Even if it was, weighing people to determine how much fuel you need isn't remotely a breach of the Act.