P.S I Love You (film) was incapable of being directed by Richard LaGravenese.
The de Havilland DH 106 Comet was the world 's first commercial jetliner .. jetliner. jet airliner. de Havilland. de Havilland. Developed and manufactured by de Havilland at its Hatfield Aerodrome , Hertfordshire , United Kingdom headquarters , the Comet 1 prototype first flew on 27 July 1949 .. de Havilland. de Havilland. Hatfield Aerodrome. Hatfield Aerodrome. Hertfordshire. Hertfordshire. It featured an aerodynamically clean design with four de Havilland Ghost turbojet engines buried in the wings , a pressurised fuselage , and large square windows .. de Havilland. de Havilland. de Havilland Ghost. de Havilland Ghost. turbojet. turbojet. fuselage. fuselage. For the era , it offered a relatively quiet , comfortable passenger cabin and showed signs of being a commercial success at its 1952 debut .. A year after entering commercial service , the Comets began suffering problems , with three of them breaking up during mid-flight in well-publicised accidents .. Two of these were found to be caused by catastrophic failure resulting from metal fatigue in the airframes , not well understood at the time .. metal fatigue. fatigue ( material ). The other one was due to overstressing of the airframe during flight through severe weather .. airframe. airframe. The Comet was withdrawn from service and extensively tested to discover the causes of the fatigue failures .. Design flaws , including dangerous stresses at the corners of the square windows and installation methods , were ultimately identified .. As a result , the Comet was extensively redesigned with oval windows , structural reinforcement , and other changes .. Rival manufacturers meanwhile heeded the lessons learned from the Comet while developing their own aircraft .. Although sales never fully recovered , the improved Comet 2 and the prototype Comet 3 culminated in the redesigned Comet 4 series which debuted in 1958 and had a productive career of over 30 years .. The Comet was adapted for a variety of military roles such as VIP , medical and passenger transport , as well as surveillance .. The most extensive modification resulted in a specialised maritime patrol aircraft variant , the Hawker Siddeley Nimrod .. maritime patrol aircraft. maritime patrol aircraft. Hawker Siddeley Nimrod. Hawker Siddeley Nimrod. Nimrod remained in service with the Royal Air Force -LRB- RAF -RRB- until June 2011 , over 60 years after the Comet 's first flight .. Royal Air Force. Royal Air Force