Between 2006 and 2007, Brazil's civil aviation sector suffered a crisis characterized by significant flight delays and cancellations, air traffic controller strikes and safety concerns about the country's airport and air traffic infrastructure. It ostensibly started after the crash of Gol Flight 1907 in September 2006, and extended to January 2008. While the government has announced a series of measures aimed at mitigating its effects, no clear solution has been found. In Brazil the crisis has been dubbed "Apagão Aéreo" ("Aerial Blackout"), an allusion to an energy crisis which Brazil experienced between 2001 and 2002. Brazil's air traffic control system Brazil's air traffic control system is run by the Brazilian Air Force (FAB). While some approach controls and control towers may have civilian controllers, the vast majority are military non-commissioned officers supervised by commissioned officers (with the totality of ARTCCs being staffed by the military, under the Department of Airspace Control (DECEA, ). The air traffic control centers are known as Integrated Air Traffic Control and Air Defense Centers (CINDACTA, ). Four CINDACTAs are in operation, located in four different cities and each responsible for different regions of Brazil's airspace. The use of military air traffic controllers for civilian traffic is not unusual, but has been deprecated in most developed countries. In the US, the Federal Aviation Administration (FAA) operates a wholly parallel system with that of the US Air Force and NORAD. This is also the case of Eurocontrol and each of its member nations' air defense systems. Brazil's use of an integrated command poses some unique challenges to the government. As members of the military, controllers are not allowed to form unions (such as the case of NATCA in the US) or to strike. While the air traffic control system saw significant improvement with the implementation of the Amazon Surveillance System (SIVAM) in the northern portion of the country, there were many warning signs that the system as a whole was heading towards an untenable situation. In 2003, the Brazilian Air Force warned of the need for upgraded equipment and additional funding. For three years, budget requests submitted by DECEA, the Air Force department in charge of air traffic control, were denied. The Tribunal de Contas da União (TCU), Brazil's supreme audit institution, issued a report after the crisis which echoed the FAB's concerns, stating that a lack of planning and underfunding of the air traffic control system