The network of 56 clubs covering more than 700,000 square feet provides a place to work, eat, or sleep, all in a modern, luxurious setting. In Boston, the Sky Club features locally inspired seafood and desserts.

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.

Starting this month, Amex cardholders will have a limited number of visits to Sky Club lounges during the calendar year. Platinum card members will have 10 visits, according to Delta. SkyMiles Reserve cardholders will max out at 15.