Is Delta Air Lines tarnishing its brand by ousting some Sky Club customers?

Delta says overcrowding forced it to change its membership rules, but many customers complain that the airline has gone too far. It’s about to be more difficult to get into Delta Sky Club lounges, and frequent flyers are already in an uproar.Many frequent travelers have grown accustomed to having access to the free drinks, snacks, and a place to relax by signing up for certain Delta-Amex co-branded credit cards. But as the Sky Clubs have become increasingly crowded—with long lines snaking ou...