What does carrier code mean?

carrier code meaning in Law Dictionary

Code assigned by IATA and widely used to recognize a carrier. Once the same signal was assigned to various providers with time, the code is certainly not constantly unique.

carrier code meaning in Business Dictionary

Two-character IATA-assigned signal that identifies a carrier on arrival/departure signs, baggage tags, Global Distribution program (GDS), passes, etc. frequently it really is an alpha code (such as for example AI for Air Asia, EI for Air Lingus, and WN for Southwest Airlines) but it is sometimes alphanumeric (including F9 for Frontier Airlines, 7Z for Laker Airlines, and 5X United Parcel Service).