Delta is testing a new customer service boarding concept called Breezeway on Concourse A in Atlanta. The new service gives premium customers – first class, business class, BusinessElite, SkyMiles Silver, Gold and Platinum Medallion members, SkyTeam Elite and SkyTeam Elite Plus – immediate boarding priority at any time during the boarding process. The designated lanes will be available at each boarding gate, and premium customers only have to access the lane with their boarding pass for priority boarding.

The program is similar to CO's boarding setup except for red mats instead of blue.

It is scheduled to be expanded to the rest of ATL and possibly the system by the end of the year.

I'm surprised it has not been posted here. They will probably have a more formal press release and web site announcement when it is more commonplace.