Sorry the article is only in spanish.
to resume, it says that both IB and LTU have an interest in taking over the route between MAD and Toluca due to fact this route was profitable.
However IB is more itnerested in having rights to operate into TLC when its unable to operate into MEX. LTU however might integrate this route in its network! Spanish government allowed LTU to operate into 6 Latin american airports so this might be an interesting one!