The International Society of Krishna Consciousness Inc. will argue next week before a federal appeals court that a city ordinance prohibiting its members from soliciting money at Los Angeles International Airport is unconstitutional.

The U.S. Court of Appeals for the Ninth Circuit has scheduled oral arguments for May 16 in the case, filed in 1997 in the religious group’s continuing legal battle for access to the nation’s largest airports. The appeal is the latest bid by the Hare Krishna adherents, who practice an evangelical form of Hinduism, to unravel restrictions on its activities since a landmark U.S. Supreme Court decision more than two decades ago.