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Finland's airline Finnair has started weighing 
 on flights from its capital city. The weigh-ins are 
 and are 
 anonymous. The new 
 is to ensure safety standards on flights are stuck to. Airplanes should not exceed the prescribed 
 weight for safe take-offs and 
. This weight is made up of the aircraft, the 
, checked baggage, cargo, onboard catering, water, and passengers. Airlines never know the 
 weight of passengers and their carry-on 
. They rely on estimates provided by aviation 
.