A sub-orbital space flight is the space flight of a craft on a ballistic trajectory
at a velocity less than first cosmic velocity; in other words, at a speed insufficient
for an artificial Earth satellite to enter orbit. However, there is no definition in
international law for the term “sub-orbital flight”; the creation of such a definition
requires the objectives of the flight of an aerospace object to be established and the
legal field in which the object operates to be defined, i.e., the definition and/or
delimitation of outer space is necessary.