Airships can operate below 20 000 and above 60 000 feet (high altitude airships). But the current world’s largest flying aircraft Airlander 10 will be able to fly up to 20 000 feet. The Airlander can stay in the air for five days with a maximum range of 4 000 nautical miles and about 4 603 miles with its hybrid capabilities. The top speed Airlander can fly is 130 kilometres per hour.