http://www.bbc.com/future/story/20140522-are-these-the-worlds-worst-plane (http://www.bbc.com/future/story/20140522-are-these-the-worlds-worst-plane)
De Haviland Comet comes to my mind, because of its square window, corners developed cracks and it finally phased out of BOAC, one crashed off Dum dum i think
http://en.wikipedia.org/wiki/De_Havilland_Comet (http://en.wikipedia.org/wiki/De_Havilland_Comet)