While a Costco membership might save you some dollars in your weekly grocery shop, one thing it won’t do is get you through airport security. The Transportation Security Agency has issued a statement clarifying that a Costco card cannot be used as valid ID when flying domestic.

The TSA clarified this week that Costco membership cards are not acceptable as a newly required REAL ID at airport security checkpoints.

Following the introduction of a new law in May, the TSA has warned travelers that Costco cards aren't valid REAL IDs and a valid form of ID is needed to travel