The main aircraft is a Boeing 757 known as Tango 01 after its military registry: "T-01" (the "T" stands for "Transport", although it is fortuitously pronounced "Tango", as in the Argentine national dance, in the NATO alphabet). The 757 entered the service in 1995 replacing the former T-01, a Boeing 707. The aircraft is nicknamed Virgen de Luján after Argentina's patron saint. The "Tango 01" 757 has been an object of political contention for the last decade (and a political campaign hot-topic during the 1999 Presidential election), with many politicians and media commentators denouncing this aircraft as an unnecessary and expensive luxury prone to abuse by presidents, their families, friends and political allies.