"Under the new system, Samoa Air passengers must type in their weight and the weight of their baggage into the online booking section of the airline's website. The rates vary depending on the distance flown: from $1 per kilogram on the airline's shortest domestic route to about $4.16 per kilogram for travel between Samoa and American Samoa. Passengers are then weighed again on scales at the airport, to check that they weren't fibbing online."