Here is a Babel Fish translation of the spanish text:
A strange cloudy series of formation brought about the surprise of the crew of a Japanese commercial airplane while it realised a flight on the sea of Okhotsk. The extended clouds presented/displayed formation, distributed of equidistant way throughout 100 kilometers in the sky. A cloud is a visible mass formed by crystals of snow or suspended drops of water in the atmosphere.
Is there a meteorologist who can comment? Are these due to gravity waves?