They may have a traditional lock-off (Clek Foonf/Fllo ... Average sized 4 year olds can often sit safely using the airplane seat belt, though not if they’re on the smaller side.
There are options out there for plus-size travelers when it comes to seat belt extenders and policies for those of size. "Airplane seats are far too small. There needs to be a minimum size ...
though some passengers were severely injured. It got me thinking about airplane seat belts and how they are different from the ones in our cars.