American Express imposed limits on how many times Amex Platinum and Delta Reserve cardholders can access the Delta Sky Club. Here's how to track your visits.

Delta customers with American Express credit cards, take note: The days of unlimited trips to the the Atlanta-based airline's Sky Club lounges are over. Driving the news: Starting this month, Amex cardholders will have a limited number of visits to Sky Club lounges during the calendar year.

Delta Air Lines is launching new Sky Club access rules Feb. 1, limiting the number of annual visits certain credit card holders can make to its airport lounges.