Which airline uses the code HA?

Hawaiian Airlines is designated with the airline code HA, which is part of the International Air Transport Association (IATA) airline code system. This code is unique to each airline and helps with the identification of airlines in ticketing, scheduling, and flight operations. Hawaiian Airlines is known for its extensive network of flights across the Hawaiian Islands as well as to the mainland U.S. and international destinations.

The other options represent different airlines with their own unique codes. Lufthansa, for example, is associated with the code LH, while Spirit Airlines uses NK, and Delta Airlines is recognized by the code DL. Each airline's code plays a crucial role in aviation operations, enhancing communication and efficiency in the industry.