The major flight and travel comparison sites say they are happy to co-operate with an investigation into how the sector works.
The Competition and Markets Authority (CMA)’s investigation into how digital comparison tools work for consumers, business and the economy, has already looked at sectors such as motor insurance and finance, and is now turning its attention to flights.
The initial study is likely to take a year and further investigation could follow.
Cheapflights managing director Andrew Shelton said he welcomes the study.
"We welcome anything that encourages transparency and helps build trust between brands and products like ours, and our users.
"The beauty of the metasearch technology that powers Cheapflights is that it is wholly independent and unbiased meaning we are able to give an honest view of a complex marketplace, often corrupted by adverts and bias.
"Building trust is central to our culture, so we’d be happy to be involved in any conversation that helps consumers feel complete confidence in our commitment to provide them with fair and transparent information."
Skyscanner said the investigation would highlight trustworthy sites that put consumer interests first.
Travelsupermarket also said it would also work with the CMA.
