飞行云 Traditional form: 飛行雲 Pinyin (reading): fēixíngyún Definitions: contrail Characters: 飞 - to fly, to dart; high 行 - to go, to walk, to move; professional 云 - cloud; to say, to speak Traditional characters: 飛 - to fly, to dart; high 行 - to go, to walk, to move; professional 雲 - cloud; to say, to speak