The historic framework of non consensual
rights or interests and their
priority
The history and policy underpinnings of (1) generic
and aircraft-specific liens and rights of retention,
which are the basis for categories that
may be declared in relation to aircraft objects
under Article 39(1)(a), and (2) generic and aircraft-
specific rights of detention (as opposed to
retention), which may be preserved pursuant to
a declaration in relation to aircraft objects under
Article 39(1)(b), provide context for the policies
of NCRIs that are reflected in Article 39, the
understanding thereof and the current and future
considerations by Contracting States in the
making of declarations and subsequent declarations
as to categories of such nationally preferred
NCRIs.