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T'way Air (ICAO: TWB), often mistakenly referred to as TKJ, is a South Korean low-cost carrier that operates domestic, regional, and increasingly, long-haul international flights. The airline is currently undergoing a significant transformation, including a planned rebranding to Trinity Airways in the first half of 2026.

T'way Air's history began on April 1, 2005, when it was founded as Hansung Airlines, commencing operations on August 13, 2005. After facing financial difficulties, Hansung Airlines ceased operations in 2009. The airline was subsequently relaunched and rebranded as T'way Air on August 13, 2010, starting scheduled flights on September 16, 2010. In June 2025, Daemyung Sono Group acquired T'way Air, and as part of its future strategy, the airline is scheduled to be renamed Trinity Airways, with a full rebranding, including a new livery and corporate identity, expected in the first half of 2026.

The airline operates primarily from its main hubs at Seoul–Gimpo International Airport for domestic flights and Seoul–Incheon International Airport for international and long-haul operations. It also utilizes Daegu International Airport as a secondary hub or focus city. T'way Air's current fleet, as of late 2025, comprises Airbus A330s (including A330-200s and A330-300s), Boeing 737-800s, Boeing 737 MAX 8s, and Boeing 777-300ERs. The airline plans to introduce five new Airbus A330neos into its fleet in 2026 to support its long-haul expansion.

T'way Air's route network encompasses scheduled domestic flights within South Korea and international services to around 40 to 55 destinations across Asia, Australia (e.g., Sydney), Europe (e.g., Frankfurt, Paris, Rome, Barcelona), and North America, with a new route to Vancouver launched in July 2025. As a low-cost carrier, T'way Air is not a member of any major international airline alliance. While primarily offering Economy Class, some of its international and long-haul flights, particularly on A330s and 777s, feature a "Business Saver" or "Business Class" with angled-flat or reverse herringbone seats. Some former Cathay Pacific Boeing 777-300ERs in its fleet even retain First Class seating, though these are typically utilized as a premium economy offering or for upgrades. Passengers can purchase in-flight meals and duty-free products on international routes.