In 1991 Cambodia issued a set of 7 stamps celebrating some of the worlds most popular airliners. Although no airline is specifically detailed on any of the stamps, these Airliners have been used world wide. The Stamps issued on June 15 are printed by lithography and are perforated 13x12½.

Scott 1152	The first stamp depicts the DC-10. Manufactured by McDonnell Douglas the DC-10 was the first commercial aircraft to roll of their assembly line. 14 different variants were manufactured. The series 30 variant has a typical range of 10,010 km and was manufactured between 1972 and 1988. 164 were built and major users were Lufthansa, Swissair, Varig, KLM and Iberia among others. The DC-10-30 was the most common model of the DC10 manufactured. As of January 2009 there were 144 DC10's in service around the world. The DC-10-30 was powered by 3 General Electric CF6-50 engines, and had a 3 person cockpit crew. The DC10 could seat 380 passengers in 1 class configuration or 250 in a 2 class cabin.
Scott 1153	The 25 Riel stamp features the McDonnell Douglas / Boeing MD-11. Although superficially similar to the DC-10, the MD-11 is longer, has improved aerodynamics and has a glass cockpit. The MD-11 first flew in January of 1990 and the first delivery to Finnair occured in December of that year. 5 variants of the MD-11 were produced between the years 1988 and 2000 for a total of 200 aircraft. 3 engine types were offered on all variants. The maximum range of the MD-11 was 12,655 km. The introduction of the glass cockpit eliminated the need of the flight engineer, reducing the cockpit crew to 2. It could carry 410, 323 or 293 passengers depending on if it was configured for a 1, 2 or 3 class cabin.
Scott 1154	Introduced in December of 1992, the IL-96-300 was designed by Ilyushin and manufactured at the Voronezh Aircraft Production Association. The IL-96-300's first flight was on September 28, 1998. It is based on the IL-86. The IL-96 is being manufactured in 4 variants, all powered by 4 Aviadvigatel PS-90 engines. The range of the IL-96-300 is 11,000 km and can accomodate 259 passengers in a 3 class layout. It has a 3 person cockpit crew and a modern glass cockpit and a fly-by-wire control system. The IL-96 is still being manufactured and is used mainly by former Soviet Bloc countries. As of 2008, 28 aircraft have been built.
Scott 1155	The Airbus A310 is shown the 100 Riel stamp. Airbus Industries 2nd aircraft, it is a shortened version of the A300. Powered by a pair of Pratt & Whitney JT9D engines the maiden flight of the A310 took place in April 1982. The typical range of the A310 is 6, 800km and seats 240 passengers in a 2 class configuration. The A310 has 4 variants and is used by the Air Forces of 7 countries. They were manufactured between 1983-2007 with 255 aircraft delivered. Major civil users are Fed EX, Air India, Air Transat and Pakistan International.
Scott 1156	With 188 produced between 1979 - 2002, the YAK-42 was designed to replace the aging TU-134. Manufactured by Yakovlev, the YAK-42 had a usual capacity of 8 first class and 96 economy class passengers with a cockpit crew of 2. The YAK-42 was powered by 3 ZMKB Progress D-36 engines. With a range of 4, 100km, the YAK-42 was a medium range aircraft. They were used by eastern bloc countries and only after the collapse of the old USSR were they exported to other regions. As of August 2007, there were still 133 YAK-42's still in service.
Scott 1157	Tupolev's TU-154 was designed to replace Aeroflot's aging turbo prop and early jet fleet. The TU-154 entered service in February 1972, almost years after its first flight in 1968. Powered by 3 Kuznetsov NK-8-2U engines the TU-154 had a typical range of 3, 500km and could accommodate between 114 - 180 passengers. It had a cockpit crew of 3 - 4. The TU-154 has several variants and is operated by former Soviet influenced nations and their airlines. Of the 919 built, 263 of all variants remain in service.
Scott 1158	The venerable DC-9 manufactured by Douglas and the McDonnell Douglas aircrraft companies were produced in many variants between 1965 and 1982. The first DC-9 flew on February 25, 1965. It was introduced into airline service on December 8, 1965 with Delta Air Lines. All variants are powered by Pratt & Whitney engines and have a range between 2, 340 and 3, 030km with a 2 crew cockpit. In a single class configuration it can seat between 90 and 135 passengers. As of February 2009 there are still 232 DC9s in service. The major user being Northwest Airlines.

Sources:
Wikipedia. http://en.wikipedia.org/wiki/DC-10
Wikipedia. http://en.wikipedia.org/wiki/MD-11
Wikipedia. http://en.wikipedia.org/wiki/Ilyushin_Il-96
Wikipedia. http://en.wikipedia.org/wiki/Airbus_A310
Wikipedia. http://en.wikipedia.org/wiki/YAK-42
Wikipedia. http://en.wikipedia.org/wiki/TU-154
Wikipedia. http://en.wikipedia.org/wiki/DC-9