A large swept-wing jet transport – its tail configuration consistent with an early Boeing 707/720 or Douglas DC-8 – is fitted with an oversized test engine pod suspended beneath the rear fuselage on a specially built lift platform. Ground crew and observers, including men in business attire likely representing engineers or the press, look on as the massive engine assembly, marked 'Aero,' is worked on. Photographs like this one document the era of large jet-engine flight testing that transformed commercial aviation during the 1960s. Project: 218191