Can anyone explain what a charter airline is? I have researched on Wikipedia and it tells me that: “Air charter is the business of renting an entire aircraft as opposed to individual aircraft seats.” This confused me because apparently airlines such as ‘TUI’ and the former ‘Thomas Cook’ are/were charter airlines. Now this got me thinking, TUI own their own aircraft right? And passengers don’t pay for the whole plane but only their seat. So I guess another question is, what makes TUI a charter airline? It would be great if anyone could explain this.