Dear English teachers,
I have a question. I noticed that news articles tend to use the definite article "the" when describing a three-letter acronym, e.g. the NFL, the NBA, the NHL, the MLB... etc. However, when describing a four(or more)-letter acronym, the definite article "the" has been omitted, e.g. NASA, FIFA, UNCCD, UNESCO... etc.
Since all these acronyms are describing similar entities like government agencies or international associations, I wonder why different rules have been applied to those four(or more)-letter acronyms?
Thank you for your help.