hey there.........................
Online agencies:
Travel & Tourism Industry Glossary : OTA. Acronym for Online Travel Agency. An OTA is a travel website that specializes in the sale of travel products to consumers. Some agencies sell a variety of travel products including flights, hotels, car rentals, cruises, activities, and packages.
and people use travel online agnecies because it is easier to work with and call and ask example for hotels and other things that are important for there work!