Passengers with a Sky Club pass from Delta Airlines can bring a companion with them to the lounges, but they have to pay a small fee. The amount is decided by the airlines and can cost around $50 per member per visit, or 5000 miles that can be used by the members only. It may also depend on the Delta Sky Lounge Guest Policy, so it is better to know about the policy in prior. If you need more information about Sky Club lounges, you can contact the Delta customer service or read the blog by Airlines Group Travel.