Travel products can be bought through a range of web sites and travel retail systems. Each of these points-of-sale are referred to as “content channels”. Travel suppliers, such as hotels, airlines and car rental companies will typically distribute their content through a number of different channels, often in an attempt to segment the market.
However, modern travel retailers aggregate the content from multiple channels to work around this strategy.
Note that metasearch engines are not considered content channels because they don’t actually retail travel products, rather they act as a sign post redirecting the user to the content channel for their chosen product.