▁was ▁announced . ▁According ▁to ▁the ▁agreement ▁the ▁air port ▁will ▁be ▁a ▁new ▁base ▁for ▁U T air ▁A viation . ▁The ▁existing ▁infrastr ucture ▁will ▁be ▁expanded ▁in ▁order ▁to ▁allocate ▁up ▁to ▁ 4 5 ▁civil ▁aircraft ▁by ▁ 2 0 1 7 . ▁ ▁As ▁of ▁May ▁ 2 0 1 9 , ▁these ▁plans ▁have ▁not ▁been ▁implemented , ▁the ▁aer od rome ▁retain s ▁its ▁military ▁status . ▁ ▁References ▁ ▁Category : A ir ports ▁built ▁in ▁the ▁Soviet ▁Union ▁Category : A ir ports ▁in ▁Kal uga ▁O blast <0x0A> </s> ▁We ight ed ▁least ▁squares ▁( W LS ), ▁also ▁known ▁as ▁weight ed ▁linear ▁regression , ▁is ▁a ▁general ization ▁of ▁ordinary ▁least ▁squares ▁and ▁linear ▁regression ▁in ▁which ▁the ▁errors ▁cov ar iance ▁matrix ▁is ▁allowed ▁to ▁be ▁different ▁from ▁an ▁identity ▁matrix . ▁W LS ▁is ▁also ▁a ▁special ization ▁of ▁generalized ▁least ▁squares ▁in ▁which ▁the ▁above ▁matrix ▁is ▁diagonal . ▁ ▁Introduction ▁A ▁special ▁case ▁of ▁generalized ▁least ▁squares ▁called ▁weight ed ▁least ▁squares ▁occurs ▁when ▁all ▁the ▁off - di ag onal ▁entries ▁of ▁ Ω ▁( the ▁correlation ▁matrix ▁of ▁the ▁resid uals ) ▁are ▁null ; ▁the ▁var ian ces ▁of ▁the ▁observations ▁( al ong ▁the ▁cov ar iance ▁matrix ▁diagonal ) ▁may ▁still ▁be ▁une qual ▁( h eter os ced astic ity ). ▁ ▁The ▁fit ▁of ▁a ▁model ▁to ▁a ▁data ▁point ▁is ▁measured ▁by ▁its ▁resid ual , ▁, ▁defined ▁as