<P> In 1991, MD - 11 was not quite a success, ongoing tests of the MD - 11 revealed a significant shortfall in the aircraft's performance . An important prospective carrier, Singapore Airlines, required a fully laden aircraft that could fly from Singapore to Paris, against strong headwinds during mid-winter; the MD - 11 did not have sufficient range for this at the time . Due to the less - than - expected performance figures, Singapore Airlines cancelled its 20 - aircraft MD - 11 order on August 2, 1991, and ordered 20 A340 - 300s instead . </P> <P> In 1992, McDonnell Douglas unveiled a study of a double deck jumbo - sized aircraft designated MD - 12 . Despite briefly leaving the market, the study was perceived as merely a public relations exercise to disguise the fact that MDC was struggling under intense pressure from Boeing and Airbus . It was clear to most in the industry that MDC had neither the resources nor the money to develop such a large aircraft, and the study quickly sank without a trace . A similar double deck concept was used in Boeing's later Ultra-Large Aircraft study intended to replace the 747, but ultimately the double deck concept would not see the light of day until the Airbus A380 in the 2000s . </P> <P> Following Boeing's 1996 acquisition of Rockwell's North American division, McDonnell Douglas merged with Boeing in August 1997 in a US $13 billion stock swap, with Boeing as the surviving company . Boeing adopted the McDonnell Douglas logo, which shows the globe being encircled in tribute to the first aerial circumnavigation which was accomplished in 1924 using Douglas aircraft . </P> <Ul> <Li> McDonnell Douglas A-4 Skyhawk (started under Douglas Aircraft, used by the Blue Angels) <Ul> <Li> McDonnell Douglas A-4G Skyhawk </Li> <Li> Project Kahu </Li> </Ul> </Li> <Li> McDonnell Douglas F - 4 Phantom II (started under McDonnell Aircraft, used by the Blue Angels and Thunderbirds) <Ul> <Li> List of McDonnell Douglas F - 4 Phantom II variants </Li> </Ul> </Li> <Li> McDonnell Douglas C - 9 </Li> <Li> McDonnell Douglas F - 15 Eagle <Ul> <Li> McDonnell Douglas F - 15E Strike Eagle </Li> <Li> McDonnell Douglas F - 15 STOL / MTD </Li> </Ul> </Li> <Li> McDonnell Douglas AV - 8B Harrier II (based on the British Aerospace Harrier) </Li> <Li> McDonnell Douglas F / A-18 Hornet (used by the Blue Angels) <Ul> <Li> McDonnell Douglas CF - 18 Hornet </Li> <Li> High Alpha Research Vehicle </Li> </Ul> </Li> <Li> McDonnell Douglas YC - 15 </Li> <Li> McDonnell Douglas T - 45 Goshawk jet trainer (based on the British Aerospace Hawk) </Li> <Li> McDonnell Douglas KC - 10 Extender </Li> <Li> McDonnell Douglas C - 17 Globemaster III (Design and early production) </Li> <Li> McDonnell Douglas A-12 Avenger II </Li> <Li> F / A-18E / F Super Hornet (Initial design and early production) </Li> </Ul>

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