Posted August 10th, 2018, 07:55 PM
Sorry but, the above assertions are false. Airlines do not limit who they sell flights to and sell them to any and all customers. The problem with sites like Kayak, Expedia, Orbitz, etc. is they do not list all available flights. As others have said, matrix.itasoftware.com is probably the most complete site to view flights although a few low cost airlines do not appear on that site either.Airlines that don’t have interline transfer agreement , like SouthWest , don’t show up in most search engines.
Another issue is looking for "direct" flights and expecting them to be non-stop. In fact, in airlineeze, direct flights have at least one stop before getting to your destination and sometimes more stops. Usually they are simply stops where you can stay on the aircraft however there are times where there are scheduled aircraft changes
Direct and non-stop are completely different and if you ask an airline employee for a direct flights, there is a good possibility your flight will have a stop and possibly an aircraft change.