WASHINGTON (Reuters) - Democratic Senator Richard Blumenthal on Friday urged Delta Air Lines ( DAL ) and DraftKings ( DKNG ) to halt a partnership to offer in-flight gaming to passengers.

Blumenthal sent letters to the companies noting a 1962 law outlaws gambling on commercial aircraft.

"This partnership seems to be aimed at enticing the flying public ... to engage in a high-risk activity from their seatbacks, while in the air and unable to walk away," Blumenthal wrote.