Scandinavian Airlines System (SAS) is the flag carrier airline of Denmark, Norway, and Sweden, operating passenger and cargo flights to over 100 destinations worldwide from its main hubs in Copenhagen, Oslo, and Stockholm; it provides scheduled air transport services, cargo logistics, and loyalty programmes for both business and leisure travellers across Europe, North America, and Asia.

SCAT Airlines is a Kazakh scheduled passenger airline based at Shymkent International Airport that operates flights within Kazakhstan and to regional international destinations across Central Asia and beyond, offering online booking and travel services.
Seabury Capital is a global aviation advisory and investment firm providing airline restructuring, investment banking, aircraft financing, asset management and consulting services to airlines, lessors and aviation investors.
Shenzhen Airlines is a provider of airlines based in China. Shenzhen Airlines is a major Chinese airline operating domestic and regional passenger services.
Signal Theory is a U.S.-based marketing and branding agency that helps companies build stronger brands using behavioural science and consumer insights. The firm provides services including brand strategy, advertising, design, and analytics to drive customer engagement and business growth.
SITA is a global air-transport IT and communications provider delivering technology used by airlines, airports and governments โ including passenger processing, baggage systems, airport operations, aircraft data connectivity, flight operations tools and air-to-ground communications.
SK&Y Associates is an aviation consultancy and aircraft remarketing firm specialising in the acquisition, disposal and transaction management of used commercial jet aircraft, providing market analysis, sourcing, sale/lease campaigns and advisory support for airlines, lessors and investors.
Skyworld Aviation is an aircraft marketing and remarketing firm specialising in regional aircraft, providing consultancy, aircraft sales, lease management and transaction support for airlines, lessors and investors.
SMIT Aviation is a UK-based aviation services company that provides aircraft leasing, charter, and ACMI (wet lease) solutions, along with aircraft sales and asset management support to airlines and operators worldwide.
Airlink (Pty) Ltd is a privately owned regional airline based in South Africa, operating scheduled passenger and cargo services across more than 45 destinations in Southern Africa; it provides reliable regional air transport, connecting smaller cities and remote locations with major hubs to support business and leisure travel.
South African Airways (SOC) Ltd is the national flag carrier of South Africa, operating scheduled passenger and cargo flights from its hub in Johannesburg to destinations across Africa and select international routes; it provides full-service air transport including passenger travel, cargo logistics, and loyalty programmes as part of the global airline network.
Southern Airways Express (iflysouthern.com) is a regional airline in the United States that offers scheduled short-haul passenger flights and on-demand charter services, primarily connecting smaller cities and communities with larger hubs, and operates under the Surf Air Mobility group.