Pan Am aircraft – here in 1963 with the abbreviation PAA for Pan Am Airways – could be seen everywhere, including from the freeway in New York before the Strato Clipper took off for Europe in 1963. (Photo by Imago)

In this photo released by Xinhua News Agency, a passenger jet that veered off a runway during take-off and caught fire is seen in the aftermath in Chongqing Jiangbei International Airport in southwestern China's Chongqing Thursday, May 12, 2022. The Chinese passenger jet left the runway upon takeoff and caught fire in western China on Thursday morning, and several people were injured. (Photo by Liu Chan/Xinhua via AP Photo)

The picture dated September 3, 2023 shows a battle reenactment at the Crosby Victory Show in Leicestershire. It is the largest World War Two re-enactment weekend of its kind in the UK and around 15,000 visitors attended over the three-day even. Visitors stepped back in time as the farmland was transformed to recreate life during the war, with trenches, armoured vehicles and WW2 aircraft displays, including the Avro Lancaster and Douglas Dakota. (Photo by Claire Hartley/Bav Media)

People visit an installation by the American sculptor, Carole Feuerman, during the exhibition of her hyperrealistic sculptures at Pier 17 in the trendy neighbourhood of Seaport in New York City on June 1, 2024. (Photo by Milo Hess/ZUMA Press Wire/Rex Features/Shutterstock)

Heat rising from the pavement distorts the view looking east on Pennsylvania Avenue NW toward the U.S. Capitol as a heat wave intensifies across the Eastern United States on June 18, 2024, in Washington, DC. (Photo by Jahi Chikwendiu/The Washington Post)

Pedestrians using umbrellas struggle against rain and strong wind in Tokyo, Japan, 16 August 2024, as typhoon Ampil is approaching. The typhoon is approaching to Kanto Tokyo area and Japan's Meteorological Agency has issued heavy rain warning. The powerful typhoon forces to suspend JR Tokaido Shinkansen bullet train service operated by JR Central Japan Company all day between Tokyo and Nagoya, central Japan, and cancel over 600 flights. (Photo by Kimimasa Mayama/EPA/EFE)

Everyone wants to get something for nothing - whether it's a lucky upgrade that means you can turn left when you get on a plane instead or heading off into the economy seats, or even getting a few extra features thrown in for free when you buy a new car.

As some of the sharpest businesses around, no-one understands this quite as well as casinos and that's why they all have a system that they call comps. It's short for "complimentary offers" and these are special treats specially designed to reward you for your loyalty to the casino in question. They're basically bonuses.

An Afghan man prepares tea for customers at a roadside tea shop on the outskirts of Jalalabad February 2, 2015. (Photo by Reuters/Parwiz)