Chile's Air Force let out an unusual critique of the F-16s it acquired from the Netherlands, raising questions about the condition of the country's front-line aviation assets. The news came in a roundabout way. Colombia's air force is shopping for new fighter jets, and is considering used F-16s. As part of that evaluation, Colombian aviators checked in with Chile's Air Force, which is the largest operator of F-16s in Latin America. Chile's response wasn't encouraging: Think twice about buying used F-16s, they said. Chilean officers said the cost and effort to upgrade the used F-16s have been more than expected, according to a report in Defensa.com. The article also quotes a Dutch officer who says some key components were replaced with used parts of lower quality before the planes were transferred to Chile. Moreover, to win U.S. approval for the sale, the Dutch had to downgrade key elements of each plane, including the radar, software, and had to remove the hardware to fire AIM-120 AMRAAM air-to-air missiles and anti-radiation missiles. FACh is upgrading all second-hand F-16s, which have already gone through the midlife upgrade, to the Tape 4 standard, which includes capabilities for advanced air-to-air missiles, advanced targeting pods and other electronic upgrades.