If you’re a frequent traveler, you’re already used to paying for a lot of things that were once free. For example, being able to choose your seat, in-flight food, and even the right to a carry-on bag.

Modern airliner designs date from the 1950s: a metal tube and swept-back wings with jet engines slung underneath. They get you where you’re going and back. But after decades of research, something ...

Did you know you can fly Ethiopian Airlines from Stockholm to Oslo, a quick 40-minute hop on a 787 Dreamliner? It’s what they call a fifth-freedom flight and it’s pretty fun as an option on this route ...