http://www.abc15.com/dpp/money/cons...-luggage-scales-don't-measure-accurate-weight Airlines continue to cash in on extra fees from overweight bags, but Valley luggage scales used to determine that baggage weight aren't always accurate. It's news that may be more important now to passengers than ever before. Most airlines charge $50 for each bag weighing 51 pounds or more. Delta Airlines charges $90 a bag and United Airlines charges $100 per bag 51pounds or over. Recent reports show that in 2010, the top five airlines collecting the most baggage fees took in $2.5 billion from those fees alone. Delta and United were included in the top five.