Every airport today has a unique three-letter identifier to streamline the process of tracking the millions of items of airport data transmitted daily, including flight plans and weather reports. Before the 1930s, existing airports used a two-letter abbreviation based on the weather station at the airports. So, at that time, LA served as the designation for Los Angeles International Airport. But, with the rapid growth in the aviation industry, the designations expanded to three letters, and LA became LAX. The letter X does not otherwise have any specific meaning in this identifier.