Given the task definition and input, reply with output. You will be given a passage, and your task is to generate a Yes/No question that is answerable based on the given passage.

World War I was the first major conflict involving the large-scale use of aircraft. Tethered observation balloons had already been employed in several wars, and would be used extensively for artillery spotting. Germany employed Zeppelins for reconnaissance over the North Sea and Baltic and also for strategic bombing raids over Britain and the Eastern Front.
were there planes in the first world war?