Allegiant Air is apparently the global airline with the greatest prowess in the field of generating ancillary revenue alongside ticket sales.
The carrier was singled out by the IdeaWorksCompany consultancy for its work in connecting additional forms of revenue through investments in hotel condos, by packaging deals on an "airline-airport-resort" basis online.
Other carriers included in a top five list of ancillary revenue leaders, produced with car rental tech provider CarTrawler, are EasyJet, Delta, Ryanair and GOL.
Airline ancillary revenue was projected to be worth around $82.2 billion on a global basis in 2017 - a 22% increase on 2016.
This figure marks an extraordinary jump of 264% from the 2010 revenue estimate of $22.6 billion, when IdeaWorks first started pulling together the data.
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EasyJet's second spot in the list is due to its tie-in with Norwegian and WestJet, to connect passengers from short-haul routes in Europe to destinations further afield.
The virtual interlining is handled via a web platform provided by tech firm Dohop, centered around connecting passengers at London Gatwick Airport.
Delta's recognition (following reinvestment from its baggage fees) is a pure-play technology tool whereby passengers can locate a bag via the carrier's mobile app.
Ryanair was singled out for a tool that allows passengers to select (and pay for) seats on its mobile app.
"Ryanair practices good retailing by using personalized messaging to alert consumers to 'on sale' pricing for a la carte items such as select seat assignments and product bundles."