Where does “авиаэскадрилья” come from?

авиаэскадрилья (Russian) comes from Russian эскадрилья, from French escadrille, from Spanish escuadrilla, from Spanish escuadra, from Spanish escuadrar, from Vulgar Latin exquadro, from Latin quadrus, from Latin quadro — and.

авиаэскадрилья (Russian): air squadron