Propeller or jet powered airplanes can produced line shaped clouds and it is called Contrails. it is existing combination of high humidity and low temperatures of the atmosphere at high altitudes. It is made mostly of water, which freezes rapidly at those heights to form ice crystals. Depending on the temperature and the humidity, contrails can remain for just a few seconds or for several hours. The airplane’s exhaust produces very little of the actual water in a contrail. Most of the water in a contrail is already in the air as the plane passes through it. (ref:http://www.nasaexplores.com/show_58_student_sh.php?id=030109110655)
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