1US A convoy consisting of two or more gliders towed in line by an aeroplane, used for the transport of freight, personnel, etc., especially during the Second World War (1939–45). Also (with capital initial): a type of aeroplane used to tow such a convoy.
2Usually with capital initial. The name of a privately-owned passenger air service providing low-cost scheduled transatlantic flights, operated by Laker Airways between 1977 and 1982.
The company's founder, Freddie Laker (1922–2006), was one of the first people to adopt the business model of the low-cost airline.
1930s; earliest use found in Popular Mechanics. From sky + train.