1. On May 15, 1933, the first flight of a commercial passenger airline in New Mexico took off from Albuquerque Municipal Airport. The flight was operated by Transcontinental and Western Air (TWA), and it traveled to Kansas City, Missouri.

2. On May 15, 1948, the University of New Mexico's baseball team won the first NCAA baseball championship in school history. The Lobos defeated USC 9-8 in the final game of the College World Series in Kalamazoo, Michigan.

3. May 15, 1885, marks the day that William Bonney, better known as Billy the Kid, was arrested in Stinking Springs, New Mexico. He was apprehended by Sheriff Pat Garrett and his posse, and was eventually tried and convicted of murder and sentenced to death.

4. On May 15, 1910, New Mexico Governor George Curry signed a law that created a Board of Health for the state. This board was responsible for setting standards for sanitation, controlling epidemics, and regulating medical practitioners.

5. Finally, on May 15, 1924, the New Mexico State Senate passed a bill that officially changed the name of the Las Vegas Hot Springs to the Montezuma Hot Springs. The springs had been a popular destination for tourists and health-seekers since the 1870s.