According to the search results, CLEAR is a trusted traveler program that allows travelers to use fingerprints or iris scans to confirm their identity and cut to the front of either the standard or TSA PreCheck security line at the airport. CLEAR is available at 51 airports across the United States, including major Delta and United hubs like Atlanta (ATL), Detroit (DTW), Newark (EWR), and Chicago-OHare (ORD) . Some of the smaller airports that have launched CLEAR service in the last year include Boise (BOI), Greenville-Spartanburg (GSP), Kansas City (MCI), Long Beach (LGB), Milwaukee (MKE), and Oklahoma City (OKC) .

To find out which airports have CLEAR, travelers can visit the CLEAR website. The website provides a list of airports and arenas nationwide where CLEAR is available, including Buffalo Niagara International Airport, Tulsa International Airport, and William P. Hobby Airport. Additionally, travelers can use their CLEAR Plus Membership to move faster through dedicated CLEAR Lanes at any of the open airport locations.

In summary, CLEAR is available at 51 airports across the United States, including major Delta and United hubs, as well as some smaller regional airports. To find out which airports have CLEAR, travelers can visit the CLEAR website or use their CLEAR Plus Membership to move faster through dedicated CLEAR Lanes at any of the open airport locations.