Airlines may consider weighing passengers to reduce the jet fuel used, thereby also reducing the environmental impacts of such fuel.

According to CNN, British software company Fuel Matrix wants to help airlines use collected passenger weight data to precisely calculate how much fuel is needed for a given flight. Scales could be built into existing screening technology already in use at airports, according to Roy Fuscone, CEO, Fuel Matrix.

“You stand in a scanner that goes round you — now, clearly while you’re standing there being scanned, you could also be being weighed — very discreetly — if you haven’t wanted to supply your information ahead of time,” said Fuscone. “It would be very discreet, very private and very confidential.”

Excess fuel is heavy and adds to fuel consumption. Improved fuel use could help reduce the 3 percent of total carbon emissions attributed to the aviation industry.

Airlines making better fuel use calculations “could have saved a lot of fuel and a lot of carbon,” said Fuscone.