Question: The cargo aircraft that was made infamous during the 1988 Kuwait Airways Flight 422 hijacking is also known for what distinctive physical feature?

Context articles: Kuwait Airways Flight 422
Junkers Ju 252
Boeing 747
Hamza akl Hamieh
South African Airways Flight 406
Cargo aircraft
Southern Airways Flight 49
Boeing Dreamlifter
All Nippon Airways Flight 857
British European Airways Flight 530

Kuwait Airways Flight 422 was a Boeing 747 jumbo jet hijacked en route from Bangkok, Thailand, to Kuwait on April 5, 1988, leading to a hostage crisis that lasted 16 days and encompassed three continents.
 The hijacking was carried out by several Lebanese guerillas who demanded the release of 17 Shi'ite Muslim prisoners being held by Kuwait for their role in the 1983 Kuwait bombings.
 During the incident the flight, initially forced to land in Iran, travelled 3,200 miles from Mashhad in northeastern Iran to Larnaca, Cyprus, and finally to Algiers.
The Junkers Ju 252 was a cargo aircraft that made its first flight in late October 1941.
 The aircraft was planned as a replacement for the Junkers Ju 52/3m in commercial airline service, but only a small number were built as cargo aircraft for the Luftwaffe.
The Boeing 747 is an American wide-body commercial jet airliner and cargo aircraft, often referred to by its original nickname, ""Jumbo Jet"".
 Its distinctive "hump" upper deck along the forward part of the aircraft makes it among the world's most recognizable aircraft, and it was the first wide-body produced.
 Manufactured by Boeing's Commercial Airplane unit in the United States, the original version of the 747 was envisioned to have 150 percent greater capacity than the Boeing 707, one of the common large commercial aircraft of the 1960s.
 First flown commercially in 1970, the 747 held the passenger capacity record for 37 years.
Hamza akl Hamieh (known simply as 'Hamza') was born in Baalbeck, Lebanon, in 1954.
 In his twenties, he became a follower of Shi'ite religious leader, Imam Musa al-Sadr.
 He gained notoriety as a prolific aircraft hijacker.
 He completed at least six hijackings between 1979 and 1982, his most notable being the hijacking of Kuwait Airways 561 in Beirut on February 24, 1982.
 Just 79 days earlier, he had completed the longest hijacking in history, after commandeering Libyan Arab Airlines 727 in midair between Zurich and Tripoli, flying 6,000 miles with multiple stops throughout Europe and the Middle East before landing in Lebanon three days later.
South African Airways Flight 406, also known as the Rietbok Crash, was a scheduled passenger flight on 13 March 1967 that crashed into the sea on approach to East London, South Africa.
 All 25 passengers and crew on board were killed.
 The air accident report speculated, without supporting evidence, that the pilot of the plane suffered a heart attack while on approach and the co-pilot was unable to regain control of the aircraft.
 Like the crash of South African Airways Flight 295 two decades later, there was, and still is great contention about the ultimate cause of the aircraft accident.
A cargo aircraft (also known as freight aircraft, freighter, airlifter or cargo jet) is a fixed-wing aircraft that is designed or converted for the carriage of cargo rather than passengers.
 Such aircraft usually do not incorporate passenger amenities and generally feature one or more large doors for loading cargo.
 Freighters may be operated by civil passenger or cargo airlines, by private individuals or by the armed forces of individual countries (for the last see military transport aircraft).
The hijacking of Southern Airways Flight 49 started on November 10, 1972 in Birmingham, Alabama, stretching over 30 hours and 4000 mi , not ending until the next evening in Havana, Cuba.
 Melvin Cale, Louis Moore, and Henry D. Jackson, Jr. successfully hijacked a Southern Airways Douglas DC-9 that was scheduled to fly from Memphis, Tennessee to Miami, Florida via Birmingham and Montgomery, Alabama and Orlando, Florida.
 The three were each facing criminal charges for unrelated incidents.
 34 people, including 31 passengers and 3 crew members, were aboard the airplane when it was hijacked.
 The hijackers' threat to crash the aircraft into a nuclear reactor led directly to the requirement that U.S. airline passengers be physically screened, beginning January 5, 1973.
The Boeing 747 Dreamlifter, also known as the Boeing 747-400 Large Cargo Freighter (LCF), is a wide-body cargo aircraft.
 At 65,000 cubic feet (1,840 cubic meters) the cargo hold is the largest in the world for an aircraft.
 It can hold three times the volume of a 747-400F freighter.
 Cargo is placed in the aircraft by the world's longest cargo loader.
 It is an extensively modified Boeing 747-400 that is used exclusively for transporting Boeing 787 Dreamliner aircraft components to Boeing's assembly plants from suppliers around the world.
All Nippon Airways Flight 857 was a scheduled flight from Tokyo Haneda Airport to Hakodate Airport that was hijacked by a lone individual on June 21, 1995.
 The aircraft was boarded by police the next morning following an over-night standoff, in the first instance where force was used to respond to an aircraft hijacking in Japan, led by the Hokkaido Prefectural Police with support from the Tokyo Metropolitan Police Department Special Assault Team (then known as the Special Armed Police).
British European Airways Flight 530, also known as the Mistberget Accident (Norwegian: "Mistberget-ulykken" ), was a controlled flight into terrain of a Douglas C-47 Skytrain into the Mistberget mountain in Eidsvoll, Norway, on 7 August 1946 at ca. 14:00.
 The British European Airways (BEA) aircraft was en-route on a scheduled flight from London's Croydon Airport and crashed during approach to Oslo Airport, Gardermoen.