In October 1949, Northwest Airlines became the first airline to serve alcohol aboard its flights. Since then, the preflight drink in first class, the free beverage on an international flight and the post-dinner nightcap have become enduring (although sometimes problematic) rituals of flying.

While alcohol was not officially served on domestic U.S. flights until the late 1940s, Northwest Airlines is often credited with being the first major carrier to serve liquor in 1949. Before this, the "Dry States" laws made serving alcohol nearly impossible for pilots to manage while flying over different jurisdictions. Following Northwest's lead, other airlines like United and TWA began offering drink services on their premium "Stratocruiser" flights in 1950. In those early years, flight attendants were actually given "liquor charts" to ensure they weren't serving alcohol while flying over "no-sale" states like Pennsylvania. Interestingly, the first international "luxury" alcohol service is often attributed to Pan Am, which served fine wines and spirits on its "Clipper" flying boats as early as the late 1930s, though these flights were outside the jurisdiction of U.S. domestic law. By the mid-1950s, the practice became so common that the FAA had to implement the "two-drink limit" to prevent intoxicated passengers from becoming a safety hazard—a rule that has evolved into the much stricter alcohol consumption regulations we see across all U.S. carriers in 2026.