Junkers is a German aircraft manufacturer founded in 1895 by Hugo Junkers. The company is best known for its pioneering all-metal aircraft designs, such as the Junkers Ju-52, which was used extensively during World War II. The term 'junkers' is also used to refer to the German military personnel who flew these planes. The crossword solution HEAPS is an appropriate description of the company's legacy, as it has produced a large number of aircraft over the years.