Delta Air Lines will cease duty free sales on international flights on 8 August, citing disagreement with its duty free vendor, DFASS.
“A replacement duty free vendor is not being explored at this time and all duty free items, catalogs and inflight advertisements will be removed from the aircraft in the coming weeks. Customers and employees interested in purchasing duty free items are reminded that most international airports offer a wide selection of products at duty free retail outlets.”
http://www.runwaygirlnetwork.com/2014/08/07/breaking-delta-to-cease-duty-free-sales-tomorrow/