ATLANTA — Delta Air Lines is joining two rivals in raising fees to check a bag on a flight within the United States.

Delta on Wednesday posted new fees of US$30 for checking a first bag and $40 for a second bag, increasing the previous fees by $5 each.

The changes match increases recently imposed by United Airlines and JetBlue Airways. By midday, American Airlines had not increased bag fees.

Southwest Airlines lets passengers check up to two bags free.

Airlines have been pulling in more revenue from extra charges for several years. Last year, U.S. carriers raised $7.4 billion from fees on checked bags and ticket changes, led by American, Delta and United.

Last month, both Air Canada and WestJet upped their fees for both the first checked bag (from $25 to $30) and the second checked bag (from $30 to $50). Air Canada’s fee hike kicks in on Oct. 5 while WestJet’s start Oct. 1.

With files from The Associated Press