How often are the IATA codes assigned or changed?

IATA codes are designed to be stable identifiers for airports and airlines, which helps in maintaining consistency across various aviation-related operations, including ticket sales, baggage handling, and flight planning. While these codes can change if there is a significant reason, such as airport renaming or structural reorganization, they are generally stable once assigned. This ensures that users, including passengers and airline staff, can reliably reference the same airport over time without confusion.

The process of changing a code involves thorough consideration, and the decision is made on a case-by-case basis, reinforcing the idea that such changes are not frequent. The option that states they can change if necessary but are generally stable once assigned accurately reflects the practice of IATA assignment.