No, you cannot buy a standard passenger seat for a big dog on a commercial airline in 2026. Most airlines have strict policies stating that seats are for human passengers only. If your dog is too large to fit in a carrier under the seat in front of you (which usually limits the dog to about 15–20 lbs), they must travel as "Manifest Cargo" in a temperature-controlled, pressurized section of the hold. The only exception to this rule is for certified Service Animals (specifically dogs trained to perform tasks for a person with a disability). Even then, the dog usually sits on the floor at the passenger's feet, though you can buy an extra seat to provide "floor space" for the dog. For those unwilling to put their big dog in cargo, the "private jet sharing" industry, such as JSX or K9 Jets, has grown significantly in 2026, allowing large dogs to sit in the cabin with their owners for a premium price.