on most commercial airlines, you can indeed buy them a "ticket" in the form of a pet travel fee. Depending on your dog's size and the airline's specific policies, this ticket allows them to fly either in the cabin with you or in the cargo hold. Options for In-Cabin Travel
For small dogs, usually weighing under (including their carrier), in-cabin travel is the standard option. Traveling with pets - United Airlines can i buy a plane ticket for my dog
While you typically cannot buy a standard passenger seat for a on most commercial airlines, you can indeed buy