A Senate panel grilled top airline executives about added fees on their baggage and seats. Senators called on the executives to justify making billions of dollars from the fees. NBC News' Brian Cheung

Senators grilled airline executives Wednesday over "junk" fees — the additional service fees airlines charge, including for selecting a seat and checking a bag.

A bipartisan group of U.S. senators harshly criticized rising airline fees for luggage and seat assignments on Wednesday, calling the fees unfair and citing how different customers are charged differently.

Senators on Wednesday harshly criticized rising airline fees for luggage and seat assignments, saying carriers are looking for new ways to extract more money from passengers. Sen. Richard Blumenthal,

Senator Richard Blumenthal, who chairs the Permanent Subcommittee on Investigations, is convening a hearing Wednesday titled "The Sky’s the Limit -- New Revelations About Airline Fees" with American Airlines,